I found this link somewhere on this group....I think it might have been Jami.
http://www.ktcrafts.com/basicgrey.html
Great Prices and Service
I like the fact that you can buy it one sheet at a time instead of having to buy the whole packet.
In fact I just placed an order last night for some more BG paper..
And Yes TAC sells it too...You just have to buy the whole packet.