We do sell the liners for the JF Oakes Yellow Jacket Traps, they are sold in a set of 5 and cost $11.25, and we do have them in stock at this time.
Yes, the JT Oakes Advantage Yellow Jacket Traps - Southern Eastern Common will work for round bees. It is designed to attracted yellow jackets, however if honey bees are attracted to the particular bait that you are using and they get into the trap then they will die as well. They will work in an open area, also.