Clara Milas: West Seneca. They won't tell you what designers they carry. I did spot several Pronovias which is the main reason I went there. I was impressed with their prices and large selection of sample sizes! They compare well with the Bridal Gown guide as far as prices go. I'm not sure about costs for alterations but it appears you can get a good deal if you find a bridal gown you like here! Service was very good also. If only they were honest about the designers! Saw lots of dresses under $700.
Bridals by D: Heard third-hand that it's a good place to go. Haven't been there yet.