I have a young GBB (Chromatopelma cyaneopubescens). I got it in February during a living things unit with my students. I don't know the sex, but it's about 2-3 inches. It's gone through two molts since February. I feed it crickets. I get ~10 small ones ever so often from a pet store. I have a plastic cricket cage that I bring in. I clean it well before getting new crickets. I keep them stocked with those orange gels, fresh greens, and water. By the time I get to feeding the last couple, they're a lot larger. It's probably less economical than raising feeders myself, but I don't have issues with sick/dead crickets or a lot of waste to clean. The crickets are still more time consuming than the tarantula!! It's an interesting experience. I thought I would want a bunch of tarantulas, but I don't. I'm really satisfied with just this one. (If I had more, I'd also have to consider raising feeders.) I'm definitely not into feeding it crickets, but at the same time, I'm learning so much about the nature of that tarantula and the crickets...a lot more than I know about much of the meat I eat. Tarantulas are amazing.
Beetles on the other hand, I'd love to raise as many types as possible.