An offshoot of the free wood option is where to find free wood.
I just had my handyman pick up 2 truck loads of cypress from the junk woodpile at a local fence maker place. They get in 10' boards but people want 8' fences, so there are piles of 2' boards wide enough to make mediums and supers, but not deeps.
I had him make me 20 swarm traps that take 8 frames. All cypress. I expect a good year next year for swarms.
Great Idea but I'm feeling you wanted this post in the best wood thread