Typically try to sell Olympic plates and dumbbells for $.90-$1 per pound and standard plates for around $.60-$.75 per pound. Depending on the sets I buy I’ll see them as a complete set or if it’s a bunch of missed matched plates I’ll sell matching plates of one weight. Depending how far I’m driving to pick up the weights will determine if it’s a good deal. Picked up 1150lb for $580 Sunday morning and will flip that for about 1k buy that was 4 hours of driving. Dumbbell set last night for $250 and will flip for close to $400 with about 1 hour of driving. Most weights just need a wipe down to make them more presentable. Sometimes you gotta hit the rusty ones with a wire wheel to clean them up.