Guinea pigs are fine for giant pythons as they have fast metabolisms and can handle fatty feeders. Boas should not eat them. Even the largest BCC adults will be fine with a young rabbit.
If you can find culled rabbit fuzzies/weans these are ideal for boas as the feeders are very lean. Weight-wise they're equivalent to a small(ish) rat. A local breeder saves them for me and I pay her by the pound so it works out for both of us.
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