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3x8
You'll need to get a 8 speed chain but they should be relatively cheap. A decent shimano (105 if you are using a road bike) or a SRAM chain should work and would probably set you back around $20. The chain will be longer than you need when you get it and you'll need to use a chain tool to remove the links that you don't need. Check out the park tools page for instructions on how to install and size your chain.
I'd advise learning how to do it yourself since it's not that hard and it might be handy if you end up breaking your chain or derailleur on a ride. If have a powerlink on you, you can always use that to convert your bike into a single speed bike and limp home from where ever you may be.
to get the chain length right you wrap the chain around your large chainring and the largest gear in your cassette, then add one link in that length. don't run it though the derailleur when your sizing it.
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