Thanks for all the responses. I thought someone said red wigglers are better because they don't burrow/are very healthy...I guess I should do some research before taking someone's word for it!
My Pacman is pretty young, and about 2 inches long (I'm estimating, as I haven't actually measured). The size of the nightcrawlers is what worried me, but I guess I could cut them.
I think I'm just going to hold out until the reptile show on Saturday (crickets until then, of course). I saw roaches there last time I went, and I'm sure they have other food items as well. Speaking of roaches, are they very good? If so, what types of roaches would be best?