I spend the most BTC at Newegg and Tigerdirect. I also buy a lot of gift cards for every day items on gyft and egifter. I went the longest time having discipline and not spending it, but once I started spending, I spent it everywhere.
In case you didn't know, you can earn bitcoin cash back for shopping at those places:
Newegg - 1%
TigerDirect - 1% to 2%
Gyft - Up to 2%
thats mostly where ive been using my coin too, the gift card sellers on here usually only offer starbucks and theres a high chance theyve been carded.