<img src="images/graemlins/blush.gif" alt="" /> Ack! I missed the thread. I plead 17 month old toddler as a defense.
Yes, you can get custom goggles with lenses delivered in different diopters, but if you mix and match, you can get *two* $20 of the shelf pairs for what one custom Rx pair of goggles usually costs.
Plus you can actually find some Rx brands like Speedo on the shelf in sporting goods stores, no waiting to order custom. Also try stores, including bike shops, that cater to triathletes- they often have lots of specialized swim gear.