Reddit mentions of Flossaid Dental Floss Holder 4 pack

There's also this. Which I think are much more comfortable than lose little ones.

TOOTHBRUSH

This is the electric toothbrush I use and recommend: Sonicare Flex Care Plus. It is cheapest at Costco but comes in a pack of 2. It's important to replace the brush head every 3-4 months. Sonicare now has a subscription service to automatically send you a new brush head when it's time to replace, or you can buy the brush heads when you need them; they come out to approx $9 each on amazon but you can get 6 for $50 at Costco and they oftentimes have a $10 instant rebate. If you need to use a manual toothbrush, I recommend the Nimbus manual toothbrush. These Wisps are really handy when you can't brush after eating.  

FLOSS

The floss I recommend is Dr. Tung's Smart Floss and you can use this  Floss Holder to make it easier to use. (Amazon only sells the floss in packs of 3 or 6 so if you want to purchase a single pack you can find it at Whole Foods, Bristol Farms, or Sprouts.) A Waterpik can also be a great tool, this one is a Handheld Waterpik and is more convenient to use. You can use it in the shower and it takes up less counter space. 

TOOTHPASTE/MOUTHWASH

This Crest Gum and Sensitivity  paste is one of my favorites and I like Act Total Care mouthwash. When choosing a toothpaste or mouthwash, look for "sodium fluoride" as an active ingredient.  It's best to stay away from mouthwashes with alcohol in them and whitening/charcoal pastes because the abrasives in them can damage the teeth. If you use a whitening rinse with hydrogen peroxide, only use it 2-3 times per week to avoid making the gum tissue sensitive. Other than that, whatever you prefer is just fine.

WHITENING

For an inexpensive whitening treatment Crest White Strips are a good option.