What is the least expensive good replacement battery for my HP Compaq NC6220 laptop?

I have looked and looked and looked online, only to be

thoroughly frustrated by the confusing mess of choices.

Prices range from around $14 for what is certain to be a piece of unusable junk

to almost as much as the laptop cost to begin with.

Some 'authorities' say to buy only original batteries from the laptop's manufacturer.

Nice idea, but I can't afford that... even $10 is a lot of money for me right now.

My hard limit is $60 including all taxes and shipping.

I don't want general-purpose links to sites -- I've seen all of them, and I'm sick of them.

Please provide the name of the source, the exact item number, and the price.

Don't suggest that I get a new laptop: There is no money available to pay for it.