I second what Mac said.
I have a Mirka 5" RO sander.? It is a good sander.? It's a paddle sander, not a switch-type, something to keep in mind.
I had a 3M, sold it, like the Mirka better.
If you get 20% off coupons from Zoro, you may be able to get a decent price.
cheers,??? Rich M.