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The heavy lifting in sanding is at the low grits. If done correctly, much like honing, moving up in grits should go quickly. So, micro mesh and high grit papers over 1k should last a long time.
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Try an Auto parts store, they usually have 1-4k. I also have bought 800-6k half sheets pack at Wall Mart, in a locked cabinet, in Automotive Dept. A good Ace Hardware has full sheets, up to 2k in...

Wow, 220?

I start at 1K and drop to 600, 600 scratches are easy to remove and 1k will buff with metal polish.

Are you removing deep scratches?

I was given a trial pack, from my son in law who said he got it at Restoration Hardware. I found the larger 8oz bottles at The Container Store, 7-8 dollars for 8oz of no. 3.

I start with a good cleaning WD40 and 0000 steel wool, then simple green and water.

Sand lightly with 1 & 2k wet & dry, polish with Mothers and paper towel, then Novus No. 3 and finish with Novus...