reefcleaners.org is where I usually go for CUC. If you're looking to order a large package of CUC liveaquaria.com has a pick your own option with free shipping at $75.
I've used Reefcleaners, Reefs2go, and Reeftopia. Reefcleaners is the best. If you order from there, make sure you get some macro algae. It comes with a lot of pods and they breed well in your tank. Macroalgae is really their best offering. If you were just going to get some snails and crabs, I would go to Underwaterworldz in Bensenville. You don't need to spend hundreds of dollars trying to pick up free shipping... LOL...
They're still out there. After going to banded trochus snails, I'm not looking back. They'll reproduce in our tanks, can right themselves and eat like pigs.