cell had them half price - might have been one of their 48 hour sales though.
Worth a look
While it may not suit your immediate need, ProBikeKit currently have 30% off GP4000S twin packs. Postage can take up to 3 weeks though, so best to stock up in advance.
Cell has them at $49.95
Bought mine for on-line for $76 a pair.
You know you could be right...well I hope so. If they are I'll go in and grab some tomorrow.
Had a puncture today which lead to a closer look at my tires....not to mention I still have the Conti Tri's on there which don't offer anything in the way of tread.
Just got an email, they are on sale at $49.95 atm at Bicycle Express.