Extra macbook pro charger

I have a 2011 13 inch macbook pro and would like another magsafe charger. I looked online and Apple sells them for 79 bucks, but I have seen some on ebay for 20 bucks that say they are OEM and look like the original chargers, but I'm not sure. Is there a place where I can get an extra charger for cheaper than $79? Thanks

on ebay watch for a1344 model should be the right one. I have purchased some, no problem.

I've purchased a 2nd used MacBook charger from an e-Bay seller...and it has worked fine. If you want a "genuine" original Apple charger...just be sure to confirm with the seller that it is actually an original one...and not a 3rd party product.

I'm not saying 3rd party products are "bad". But if you desire an original charger (used) for less than $79...than you just want to be clear. So if when you get it...and if it's not an original Apple charger...you then have grounds to return it (if you desire).

- Nick

Thanks guys