Thanks for the leads, folks! I've been looking at reefdive's shrimp, as well as speedie's. I'm probably going to start out with 10 shrimp, and I'd like a good genetic diversity to start, so I may order the 10 from a couple of different people.
I may end up waiting a little while to get the Endler's. After thinking about it, I'd probably do best if I allow my shrimp colony to get established a bit before I add them. I'll definitely keep you in mind though, philemon, so thanks!