This has been addressed many times, and is in the archives.
I use Hi-Tech in Dallas TX, hitechpmr.com. They have no minimum,
charge 2% of the total amount of recovered gold with no other fees,
and send a check the same day they receive your scrap (sweeps take
about a week). Send it in by overnight delivery on Monday (they will
even schedule a pick-up for you) and get a check (or metal) by return
overnight delivery on Wednesday. They also include a printout of your
assay that includes many different metals, so you can see exactly
what was in your scrap. If you are in the Dallas area, you can take
it to them (they are in the building Roseco used to be in on Gamma
Road, just north of 635) they can do it while you wait, takes about
fifteen minutes usually.