I called John at Advanced Acrylics today. He quoted $765 with shipping for a 40g breeder (36 L x 16 H x 18 W.) which would be a custom and this includes hand polishing and eurobracing. Acrylic is half-inch thickness.I'm interested to hear what yoru experiences are. I'm dealing with John at Adavanced Acrylic. He's working on quoting me a 210 long, 67 gallon sump, and separate ATO. The prices seem super competitive and he's responding extremely quickly. I hope they treat you well!
On a related note, I spoke with the guru at my LFS who commented that the Sea Clear tank at Fishtanks direct which is $345 for a 50g is most likely using acrylic that is 3/8 inch thickness leading to the significantly lower price. Also he said these tanks are from China.
Overall, I would assume and hope the product from John @ Advanced Acrylic is on a whole other level