I looked around for the 27's for a while but only found a few places that even had them, I think aspirevelotech had them for $105 a piece with free shipping, which is not cheap but at least they aren't $120 per. I think the 24's are a little easier to come by.
If you or anyone else finds someplace that has them for less I would be interested as well. I keep hoping PBK will stock them as they have decent prices on other Vittoria's but I haven't seen Pave's there.