Reddit mentions of Final Audio Black Silicone Eartips Compatible with 1More, AKG, Audio-Technica, Beats by Dre, Campfire Audio, Empire Ears, Sony (5-Pairs, Multi)

OK, buckle-up! I'm going to save you a several hour journey into the bowels of the internet to hunt down all this particular information. :-)

Better Ear Tips for the BLON BL-03:

For good ear tips, pick up some Sony MH755 earphones for the BLONs. (They are available for ~$5 on Aliexpress, roughly the same on Ebay). The tips off of these Sony's are a perfect fit/match for the Blons. An added plus is that they come with an assortment of different sized tips, so you can pick the ones with the best fit for you.

Another great option on ear tips for the BLONs are the Final Audio Type E tips. Here's a source for them on Amazon. (I like these a little better than the MH755 tips, but either are really nice upgrades for the BLONs.)

Another tip for tips on BLONs... (Hah! Sorry, couldn't resist!) Some folks (to include me) add these small gaskets around the BLON's stem base in order to help get whatever tips they use to extend up and further out - sort of a tip booster seat. :-) This really helps to deliver a better seal. (The BLON stems are notoriously short, so folks with larger ears will definitely benefit from doing this more so than folks with small ears.)

Better cables for the BLON BL-03:

The Blons use a square, protruded .78mm 2 pin connector. (NX7-style). These are a bit harder to find, but they are out there if you want a perfect match to the square connector housing. (Note that you may need to trim the pins down a little to make them flush with the connector housing though - easily done using a pair of wire snips. Thanks Tacanacy!) Cable example: https://www.aliexpress.com/item/4000129870705.html (Choosing the NX7 style option... Note these cables are probably overkill, but they are really nice cables.)

If you are willing to file/cut down the square edges of the Blon's cable connector to make it a bit more oval (using a hobby knife or small file), they can easily be made to fit any QDC or type "C" connector which is a pretty standard cable connector type. This will let you then fit any QDC connector based cable over the Blon's protruded plug and get a nice snug fit up against the housing of the Blon. Lots more options in types/brands of cable if you go this route. Here's a nice example: https://www.aliexpress.com/item/33018785015.html (Choosing the "QDC 3.5" option)

If you don't want to do the above mod (shave down the square edges of the Blon's connector), any exposed (non-hooded) connector that uses two pins (.78mm) will work just fine with the Blons, but they will be flush with the connector and not cover or sleeve over it. They will still be 100% functional and work great though.

As to cable brands, I've found that all of these are really good quality (in my order of preference): Nicehck, Kbear, Tripowin, Yinyoo, TRN

Also, if you see a bunch of different cable plug connectors (2.5mm, 3.5mm, 4.4mm) and don't know which is which, the 3.5mm plug is the one you'll want - it's the standard that will fit pretty much every audio device out there. (The others are typically used more with esoteric/higher-end audio gear which utilize balanced cable connections - ones which don't share a common ground wire between the left/right channels and require more connector contacts and an additional wire in the mix.)

I'd also recommend that you pick out at least an 8 core braided cable as they tend to be a bit thicker and *much* less tangle prone then the stock cables or others that use thinner wires. I really like the look/feel of the 16 core cables myself, but they may be a bit on the bulky side for some, especially if you plan to use them for fitness activities or around the gym.

And finally, if you are still reading this wall of text, no matter which cables you get, be sure to get the orientation of the plug right otherwise your audio will be out of phase and may sound a bit odd. It's pretty easy to mix up the plug orientation on the connectors! Here's a site you can use to check to make sure you got them right: https://www.audiocheck.net/audiotests_polaritycheck.php

Hope all this info helped!

I needed to update this as promised.

The suggested ear tips arrived and fixed every single issue with the BLONs. Super tight bass, very clean mids and sparkly highs.