I'm making my living buying and selling "stuff" at flea markets, auctions and on E-Bay.
Back several months ago, I bought a lot of 10 knives like you are showing for $25. Tried selling them at different flea markets, etc. Finally ended up selling them, as a lot, at an auction for $20.
Everybody at flea markets nowadays, at least down here in the deep south, is trying to
sell China crap. The market is flooded with it. I have done much, much, better with simple
handmade knives that I make myself. Selling in the $20-$30 dollar range. Since you are a
carpenter, should be easy for you to make a few and try it.
IMHO the Chinese Crap selling is a dead end, financially and spiritually.
alan