Many good ideas on here. Another, perhaps, is building raised beds from free pallets. I approached our local natural food co-op store about me assembling one for display so people could see the end product and then selling kits out of the co-op. The manager was all for it. I could also then offer to deliver the kit, assemble it, and maybe even get soil into it as added offered services, for extra fees, of course. Around where we live the raised beds are not cheap! I would also stain the wood and put a layer of protection on it with a non-toxic product I found (for which I cannot find the link at the moment) so they last much longer. And if I had the time and was feeling really creative, I would also offer to add either some color or draw some designs or simple flowers on them (that's the extent of my art ability

). I would also post them on Craigslist and approach any other privately owned store in our area that might have customers interested in a raised bed. In your zone, now would be the best time to get going on that! Here are a couple of links to videos on youtube giving ideas on building raised beds from pallets:
https://www.youtube.com/watch?v=JSJbGvElvfo
https://www.youtube.com/watch?v=zhPvJSLZ5Io
Another idea also using free pallets is to build free-standing bookshelves. I did that also and it came out great! The only thing I paid for was the side of the bookshelves since the pallets I had did not have long enough boards for my needs, and the hardware. Solid wooden bookshelves are pricey. And as was mentioned, once you have your parts list, pre-cut quite a few which will make the whole process much faster. I stained the bookshelf to pull together the different color wood pieces from the different pallets so it would look more uniform. It came out very well and quite solid. The finished bookshelf was 72" H x 15" D x 42" W and ended up costing about $40. Your profit margin from that would be a nice chunk. And if you built lower standing bookshelves, you wouldn't even need to purchase the side pieces for the height; you could just use the pallet wood for that also and your only cost would be the hardware and a bit of stain, but that often can be gotten free on freecycle.org which is where I got mine.
So many possibilities!
