Perscription Swim Googles

I just ordered a pair of these and they're available in prescription.
http://www.sablewateroptics.com/goggles/rs101.php

At $50 they're expensive swim goggles, but from the research I've done I'm hoping they're pretty good. 

www.swimoutlet.com has them for about $20.  Mine fit great.  Just choose your persciption strenth and order.  You can even buy each side separately you you happen to have a different perscription for each eye.

I only wear mine for emergency use, i.e. contact lens issue, but they are comfortable enough to use every day.

Edit: Direct link to the prescription goggles:  http://www.swimoutlet.com/Prescription_Swim_Goggles_s/326.htm

I use Aquagoggles.  You can buy the eye cups in different strengths if your eyes are different.

http://www.aquagoggles.com/

Another vote for Aquagoggles for me. I have *very* different prescriptions in each eye, so it was crucial to accommodate that.

+1 on Swimoutlet. 

They have good selection available in a range of  corrections.  For near-sighted people the general recommendation is round DOWN your prescription.  Example- If your correction is -3.25/-3.5, order -3.0 (NOT -4.0).

Not sure if it's an option for you, but I would seriously recommend getting contacts for sports only.  I wear glasses all day at work and at home.  I put contacts in solely for swimming, biking, and running.  It's very affordable, because you're not wearing them all the time.  A one month pair will last you 4-6 months.  I actually have contacts that aren't "ideal" for my prescription and astigmatism, but since I don't need to do a lot of reading during s/b/r, I have no problems at all with the cheaper contacts I went with versus the ones that correct for astigmatism.