Borrow G5 graphics card

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I'd like to borrow a graphics card for suitable for a G5 tower (not a  
ATI Radeon 9600XT).  I only need it for a few days and I'd be happy  
to negotiate some kind of payment for the loan of the card.

I've had an issue with my G5 tower for a long time and I've got  
strong suspicions that my 9600XT graphics card is to blame for my  
problems.  The machine is well under warranty but Apple support have  
been giving me the run around.

If anyone could help I'd really appreciate it.
Ruben A. Franke