Well there's AA Imports and Castle Reproductions, but I'm going to buck the trend a little here and stand up for Rossos!
Rosso don't only trade in wholesale reproduction glass. They also sell Fenton Art Glass. Rosso are not covert about their activities in any way - their website is very clear. I have bought some lovely pieces of contemporary glass from them in the past. They have many well-made and affordable items.
The problems of any reproduction glass come when the pieces change hands a few times.........