Good question. Rejuvenation.com has some at an excellent price.

I ordered mine from Vintage Tubs on 1/19 and it's supposed to leave the warehouse on 1/31. Since I haven't gotten it yet, I can't say for sure that it will be as wonderful as I hope, but I'll be finding out soon. I am impressed with their service so far - they quickly answered my questions, told me when and how the tub would ship, and sent an email to tell me exactly how to inspect the tub and what to write on the shipping receipt to protect myself in case there is damage during shipping. It's a 5' tub with great dimensions (the lean back is better for me than some tubs) and it cost $979 before the $100 discount I got for also ordering a tub drain and tub faucet. And the shipping is free.