Yes you can buy BPs at the show.
And the 'rule' is to wait until the snakes 3rd winter and at least 1200 - 1500g before attempting to breed her. But some snakes get bigger faster and its possible to hit that mark on the 2nd winter.
As for the co-dom vs recessive, its personal choice. Obviously with co-dom you have odds of getting the visual the first year breeding. But the recessives you could pick up a pair of hets for fairly cheap and have a chance at getting a visual first shot from them too.
It's all up to your preference and experience as to what you decide to do. But good luck with whatever path you choose, and remember its addicting.
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