If all you are shooting for is bumblebee (a worthy target) it might be slightly cheaper to go with a pastel male and a female spider. I think the spiders are pretty close to the same for both genders but the male pastel should be a fair % cheaper than a female pastel. But then the female pastel might be more valuable later (for making killer bee without having to raise up another female for example), which is probably why they are more expensive.