I'd keep an eye out for an Eppendorf 5415C microcentrifuge.
I got two of them off ebay from separate sellers. One for $50 and one for $75.
Look for ones that have "Best Offer" and see if you can get them for cheap. Sometimes your offer will get rejected, but you can just try again. The seller I spoke to said they just want to move equipment, so getting $75 today is better than maybe getting $200 sometime in the next month. Or, check for one that has a buy it now within your range.
You can also click on "sold listings" at the top, and check what ones sold for what price from what seller, then go to that sellers shop and see if they have multiple items of the same type for sale, or send them an email saying you're interested in buying another microcentrifuge if they get one in stock again soon.
I can't comment on the usefulness or lack of usefulness of a single speed. I basically use 10krpm and 13krpm on mine (13krpm 95% of the time) so perhaps a single speed would work fine.
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