I have a semi-urgent question regarding ethernet cards...

I have found a PDS ethernet card for dirt cheap, but it uses a BNC
connector for thin ethernet.  The question is, does there exist any
adapter to convert this connector to RJ45 for 10BaseT?  If so, how
available is such a thing and at what price? 

The issue is semi-urgent because I have to act very soon if I want to buy
the thing, but if I don't get it it's not the end of the world.

Thanks!

Jeffrey Ohlmann