Sounds like a good price to me. I'd ask for a model number and check koyo's website to verify authenticity. I checked Koyo's website (http://www.koyo-radiator.com/Koyo_Acura_Radiators.html) and there prices average $299, on sale. If all looks well, your getting it at a third of MSRP. Also see if the manufacturer will honor the warranty. I like using ebay too, but sometimes there sellers are very crooked, and post misleading ads.

I guess if your not happy with the looks when you receive it, you can always sell it.

Did you use honda-tech market place at all? Sometimes they actually have better price & quality than ebay.