As mentioned by Blues Dawg, the Pro4 Endurance is also on the market now. Amazon has some good prices on them too. You may try Pro Bike Kit's on-line shop, they have a really good deal on buying 2,4, or 6 tires with the discount going up as the number purchased goes up on the Pro4 Service course for one, check them for others. John, have you checked your LBS or did I miss this? They may put a deal on you.

Bill