I agree that the first one could be a mammillaria, though it also looks like it could be an echinocereus to me (the glochids are more pronounced and larger than on most mammillarias that I have seen); the second appears to be something in the trichocereus family to me, though it could also be one of the haageocereus...; the third "wooly" one is probably either a cephalocereus or oreocereus. Enjoy them while they are young, if you pot them up and give them plenty of root space & feeding they will grow rapidly (and the blooms are always nice!)
Adam
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I've never met an orchid I couldn't kill...
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