Just keep in mind, by that time bees will be a dime a dozen.... and you will be doing the same exact thing a whole lot of other people are doing (hence the reason they will be a dime a dozen).
But that is just the Morph game... I suggest you try thinking outside the box or don't bother. Instead of buying 3 female bumble bees, use that same money to buy 1 female who's babies will still be worth something when she makes them.