+1 on going to a local roaster and asking for older beans. Has worked for me several times.

If you cant get beans from a roaster, I go to costco and get a couple 5lb bags and regrind them on settings getting gradually coarser. It has worked well for me and it's like passing a load more then you purchased. I also align first, and then throughly clean everything out after so I'm good to go

If you're in suburban Minneapolis,,,I've had trouble finding anyone with bad roasts or waste beans they want to give away or sell very cheaply. I found a roaster near Brooklyn Park who sold me 2 pounds for $10, but also said they don't have waste beans becasue they don't make many mistakes. Funny part was they smelled good so I started using the beans and they were nice! Like others have said, Costco or Aldi or some other discount store is probably the easiest route.