I refuse to buy most clear stuff but you'll probably have good luck with ICS and SRC products.
I would still avoid them myself however just because I have another source.
There are lots of chronos available. The madbull one comes to mind as does the Laylax one (I saw this in a video review recently and it seems interesting, as well laylax is a big name in quality airsoft stuff).
I don't know what your store caters to or how you run your business and what market segment you're targeting so I'll reserve my opinions to myself. (ie. If you're a BMW dealer, would you locate yourself in some low income/single parent neighbourhood or on "the hills", same with a Hyundai or Kia dealer, "the hills" or in a low income area that's where the majority of your market segment is).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE