ebay shouldn't be a problem. I bought my xbox on ebay, I also bought a laptop on ebay.
Even if the NES isn't perfect (i.e., it has trouble loading games - the flashing red light) you can fix it easily:
http://www6.instantestore.net/merchant5200/pd_nes.cfm
http://www.nintendorepairshop.com/shopexd.asp?id=78
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This is my cool grafix Sig
-And this is something witty beneath it-
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