ohboyohboyohboyohboy new tinky footy
If you don't mind having the quality and aspect ratio I've been uploading my vids in than you should thake a look at this one, it's probably the cheapest choice with decent quality
http://www.ezcap.tv/usb-game-capture...r-capture-card
Now since I'm not using it with mac myself I can't say if it works well with it but they advertise it on their website as compatible with mac OS.