Doesn't answer your question but this is where I go for stuff.
My first-stop places for 510-threaded stuff (and where I send people for real Joye brand stuff) are Liberty-Flights.com and LiteCigUSA.net though I occasionally send people to Cignot.com for Ego-T or 510-T stuff (like the soft doors for the tanks).
I use Madvapes and Gotvapes for cool clone Ego stuff like the multivoltage batteries and short cones that just cover the threads and some nice drip tips.
My almost 1-stop shop for KR808D-1 stuff is V4L.com for their manual long-drag batteries (long safety cutoff), their WOW cartos and my two favorite juices for cartos (thin and clear, 2 of their WOW juices). But I also buy Bloogplanet's cartos - I like those too.
My places for cheap mods are ECF's Buying & Selling Modder and Classified sections, and Madvapes, and ecigworkshop for wood mods.
My go-to place for mod batteries especially AW IMR is Super T Manufacturing. Chargers from there, CloudsofVapor or elsehwere.
For juices I am all over the place for occasional juices. I literally tried over 100 juices from over a dozen vendors trying to find juices I like in high PG low VG for my cartos that are clear and drop no carto-clogging flavoring sediment. Fortunately my two main juices ended up being from the same place - V4L, and I have a KR808D-1 model so I was able to try their carto packs and sample packs to find the ones I liked (I disliked many but it was worth it to find my favorite juices). There are a few juices scattered at other vendors that I restock occasionally.