5 Speed Cassette

So I am cleaning up an old bike, its probably around the same age as I am, and it still has its original 5 speed cassette on it. The teeth are pretty blunt, or square, so that definitely needs to be replaced. So far I haven't been able to find one online, do you guys know if companies still make 5 speed cassettes?
'09 Rocky Mountain Fusion
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have a read
http://www.sheldonbrown.com/free-k7.html
Parktools :?:SheldonBrown
but most likely LBS time, we have a few in boxes.
Parktools :?:SheldonBrown
Asked my mom how old the bike is, apparently I am only a year older than it, so about 18 years with out any parts being replaced.