There are cheaper capture devices around such as - http://www.dabs.com/products/hauppauge-wintv-usb-live2-usb-2-0-anolog-capture-7FGS.html?src=http://forums.bethsoft.com/topic/1371239-does-anybody-know-any-other-way-to-make-pictures-of-skyrim-on-a-ps3/15* - that will give good quality results.
Just remember to shop around for a deal and that it is not always true that the more you spend the better quality you get! That said, decide if you really, really need the more expensive item that you will use often or will the cheaper item be adequate for your needs.

*Edit: I use a similar device to record my old family VHS with Windows Live Movie Maker for example.