I was using
My Free Sex Store for a bit. They've got the pricing options that you may be looking for, but not as much as far as original designs or SEO work. Also had quite a few instances of down time in the few weeks I had it, but I think they worked out those kinks.
Now I'm using
My Free Website / Sex Toy Fun. They don't seem to have the price flexibility, but I can do a lot more as far as design, selection, and SEO. I've also had more sales with it than I did with My Free Sex Store. They've got a dropship side as well, where you can do your own thing as far as pricing and design goes.