Since most wild bees are native to certain geographies and don't lend themselves to being kept in captivity, we are not in the business of selling specific bee species. Shipping cocoons also risks spreading diseases between geographies even when care is taken to avoid this, and so this is not something we plan to do either. The best way to attract more bees is to grow flowering plants that are native to your area, and to support others that are looking to do the same in public spaces. Without the right habitat to support them, even the nicest bee homes will not attract residents.