I have a few excel spreadsheets that I'd like my friends to edit.

The "free" services out there, like zoho and editgrid don't work as well. I found out that sharepoint would be right for me.

However, I can't find anything for under $10 (with no subscription/contracts)

I need 20MB of space and am going to have about 2 - 4 people edit the spreadsheet(s).

Is this possible?

You may want to check out Microsoft's hosted Sharepoint solution:
http://www.microsoft.com/online/sharepoint-online.mspx (http://www.microsoft.com/online/sharepoint-online.mspx)

I didn't even know they had such a service. Thanks! First friendly reply I got on this website. All the others were bashing me for what I wanted.