1) Whole Foods:
a) Customers are tech savvy, have disposable income.
b) Supermarkets are in a very competitive low margin business space. A few tenths of a per cent increase in profit by reducing credit card use is a big deal.
2) Allied Electronics, Newark Electronics
a) Geek kingdoms.
b) For individual/home purchases, widespread credit card use. Offers a potential 1% - 3% profit boost or customer discount for using BTC.
+1 for whole foods.