BRB's are not too difficult to take care of. I keep the hot side at 83 and the cool at 75 with 75%+ humidity. I also give her a humid box & big water bowl. Mine is in a tub temporarily until her new enclosure comes in and she just had a perfect shed not too long ago. The only thing I would consider is how healthy is the BRB? I wouldn't agree on the trade till I knew that. At the two reptile expo's I have gone to, I have seen one retired male priced at $200 and a full grown male (assumed not retired) priced at $300.

In all honesty I rate the value of a snake by
1) Health
2) Morph (if applicable) & Genetics
3) Age
4) General Look
5) (If for a pet) How Easy is it Handled?
5) Gender
6) How Much I Personally Want that Particular Snake

Hope that is helpful.