Reddit mentions of UDI U818A-HD 2.4GHz 4 CH 6 Axis Headless RC Quadcopter w/ HD Camera, Extra Battery

They are really fun. I definitely recommend it as a hobby, though I will echo sentiments that you're likely to frequently encounter when researching: "It can be an addictive - and an increasingly expensive habit to feed".

Just a quick note on learning on a cheaper one... There's a huge gap between the lower end cheap ones and higher end ones in terms of how you fly them. It's kinda of counter intuitive, but learning to fly one of the <$100 won't really translate too much to flying a $500+ one (like a DJI Phantom or the sort). The cheaper ones are much more difficult to fly, in that they don't auto hoover, aren't really stabilized and are just generally more erratic. This all said, I still definitely recommend learning on a <$100 before moving on - if not for anything more than just learning the basic principals and to learn if you really like the hobby as much as you think you would (A lot of people invest big up front and then leave it in the closet after 2-3 flights).

I started with really small 'nano' ones... Something like this. I can't speak to latest and greatest in terms of this model, but people really like Hubsans and their parts can be found cheaply on eBay and the sort. These are fun because you can relatively safely fly them inside, where conditions are more easily controlled. Be careful: they still hurt/injure if you or an animal gets whacked and they can still may do some damage to something like a TV if crashed just right.

I later moved up to something a bit bigger like this UDI. These are fun in that you can fly them outside more easily than the nano ones.. This said, it still has to be 100% calm when you're flying these - they are extremely light and will get carried off (and often deposited 50ft into a tree) in the blink of an eye. These often do cool things like "flip" and also have some basic "Return to Home" functionality (though nothing like what you will see called 'RTH' on something like a Phantom).

Similar to the UDI one, this model is also very popular with people getting started. If you read around quad forums, you will frequently see Syma mentioned as a good getting started brand. As with the others, new motors, additional blades, additional batteries and the sort can be found cheaply on eBay and Amazon...

Much beyond this and you're looking at dropping ~$300-$500 to get a noticeable change in the kind of aircraft you're buying... There are some racers that you can get started with for <$300-500 (Eachine) that seem neat and are popular - but they're generally considered 'advanced' in terms of flying in that they don't often auto hoover or auto stabilize, so you are required to constantly control all aspects of flight at all times. If 'getting a stable picture or video' factors into your desire of ownership, then these aren't likely to fulfill the want as there's often a lot of movement and vibration at play... People really like using these racing ones with First Person Viewer (FPV) goggles - so that you're essentially riding a rollercoaster in the air and off the tracks :D Note of caution when moving into these sorts of quads: These aren't toys and they can do VERY serious injury of not handled properly (high RPM carbon blades smacking you in the face might just remove your 'ability to see' superpower... I won't go into the possibility accidental decapitation).

For me, as someone who's using mine as more of an extension to my photography hobby than I am anything, DJI makes some quality aircraft for the purpose of capturing pretty videos and pictures... Their aircraft are also the easiest to fly of any that I've personally had hands on experience with... Like the last 'category', these aren't really toys - though I'd also say that these aren't 'as dangerous' as the previous category in that they do somewhat fly themselves (and often actively avoid hitting things if they can see them) - though you can certain still do some damage/injurty. Currently, on the DJI front, I own a Phantom 3 Pro and a Mavic Pro. Since newer models have come out, you can get a Phantom 3 Standard for ~$400, which is an exceptional value imho. Phantom 3 Pros can be had for ~$600, which gets you about double the flight distance, 4K recording, 720 First Person View Live Feed to the controller, and more rapid charging compared to the standard (worth the extra $$$ in my opinion). The Phantom series are quite bulky and so somewhat difficult to carry with when traveling - enter the Mavic Pro, which is collapsable and so the whole carry package is about the same size as a DSLR bag. The Mavic Pro is going to set you back $1200-1500 (just like was the case for the Phantom 3 series before the Mavic and the 4 came out).

Anywhos... Hope this helps... It really is a fun hobby - at any of the mentioned price points... Way I figure it, there's very little risk in trying out an entry level one - you're in ~$30, which you're more than likely to get your money's worth out of even if you decide to not pursue the hobby further into more advanced ones. Heck, even with my fancy ones, I still break my pico out from time to time as a form of procrastination in my office :)