Yeah - ebay's Ok but make sure you check over what you're getting before you hand over the cash.
I bought a set of Audi TT alloys t'other day for ?310 (with tyres). "What a good deal!", I hear you cry - I thought so too, but when I met the guy one of the tyres had no tread (even though it was advertised as all 4 tyres with good tread). The chap took some money off, I was happy and away I went, only to discover when I got home that another tyre had a bloody slow-puncture (a small nail was stuck in between a couple of the tread-blocks which I didn't spot at the time).
Luckily, The guy I bought them off has been pretty good though and in the end I got them for ?250, and have spent about the same on tyres! However, you might not be so lucky as to deal with such a reasonable chap!
I'm not that bothered though, cos ?500 for some mint audi alloys + tyres aint bad in my book

Rich