I'm not looking to spend money if I don't need to.>I assume you refer to a time release vial? Where do you get these?
I don't use them anymore since I discovered that lemon grass oil works as well and is cheaper, but most of the bee supply places sell the vials full of lemongrass oil at a premium. Someone posted somewhere a place to buy the empty vials, but I don't have that information. I think it was on here (Beesource) so you might try searching past posts.
I like the way you think.I am not in the books as a great swarm catcher, but everyone says less is more. The last time I had a trap I put a q-tip dipped in LGO in a zip lock plastic bag with just a few pinholes in it. This will act like a "time release vial" in that it will not dry out as fast. It attracted bees just fine. J