Okay, update. I finally got all that stuff, Reptisun, thermometer, etc. I also got a few different kinds of worms: phoenix, silk, and very small supers (which came directly recommended to me by the woman that runs Atomic Lizard Ranch). I managed to get a few phoenix worms from a friend a few days ago, and have been only feeding two a day to it for the past three days so its stomach can get used to it.
For the record, ever since I started feeding it phoenix worms, its uptake in crickets has dramatically increased. I think he just needed variety.
Anyhow, I just got the other two types of worms today, and I know you're only supposed to feed it one or two for the first few days, but I wasn't sure if it was safe to introduce both types at the same time.