In reply to kermit_uk:
As far as I know there isn't anywhere you can rent that kind of thing, the mountain shop rents bouldering pads/shoes, but I don't think gear unless you are with one of their guides.
There is a healthy second hand market of gear in camp 4 (three ledges currently for sale on the notice board), or just make friends with your big wall campsite buddy (buy them beer, hump loads down from El cap for them etc) and you never know they might loan you something.