Pricing an demanding breed info for king an milk snakes.

Hi, iv been out of the reptiles business for a few years I used to breed boas well I had somewhat success but I'm ready to get back into reptiles again an I wanna concentrate on mostly kings an ball pythons Some boas too. I wanna know what is new an what is selling. Basically what would be a good investment? However I'm still going to work with boas because that's where my passion really is but they take a lot of room. Sorry if I rambled on a bit. I'm thinking mostly kings/milks an balls. Any help is appreciated thanks.

Brock.