Favorite hardware vendors (510 equipment):
Discount Vapers - great CS, fast shipping, lots of selection including resonable priced mechanicals, good prices.
VaporBeast - great CS, super fast free shipping
Hoosier e-Cig Supply - good CS, great prices, good selection- has been my go to place for cartomizers
Liberty Flights - great CS, fast cheap shipping, they carry my 2ohm EMSCCs
Madvapes - fast shipping, good for general random stuff
My Vapor Store - good CS, fast shipping, lots of stuff
Favorite hardware vendor for KR808D-1 stuff: Smokeless Image - just plain excellent all 'round.
Favorites for e-Juice (I DIY, but hubby gets the pre-made stuff)
My Vapor Store (both of us. Him: Flue Cured, Me: Menthol Sensation)
Liberty Flights (Him: Flue Cured)
Mr. E-Liquid (Me: menthol...but not since I started DIY)
Smokeless Image (Him: Cowboy or "Country")
I get my DIY supplies from One Stop DIY Shop, My Freedom Smokes and Amazon.