A good friend om mine on this forum helped me getting my colony up to 500 Turkistan roaches. Their breeding as we speak, and once they start to breed there's no stopping them. They live waaaayyy longer than crickets. Feeding is easy, just give them a carrot, potato, oranges etc.You feed, they eat. Just add 30degrees heat and they flourish.

Would a big Turk be able to feed a Grammostole pulchripes?

Or I guess it depends on what you feed them?

If it takes one directly and done eating you can always throw in another one. I have noticed a G.pulchripes is quite brave taking food bigger than the T itself. The great thing about the raoches as well, is that you can leave them in the enclosure till the T eats it.