1) No. Not two males. Unless you are experience, I wouldn't recommend keeping two bp's together no matter what the sex is. Especially two males, they can fight. You also have to quarrantine your new baby, no matter where you purchased him from. Quarrantine in a different room is the preference, for I think 6 to 8 weeks, most would do longer.
2) See #1
3) See #1
4) Prices change so much I can't keep up. A Spider can be anywhere from 200 to 300, and a bee anyhwere from 600-900. It varies though.
5) Yes. It is an excellent place to pick up a bp. Then you can visually see the animal, and get the one that looks good to you. You can also talk to the breeder face to face, and ask important questions about the feeding schedule, and any trouble he has had.
I hope this helps.