If there is a certain item we want as a reward what would be the best place to look to see which site requires the least work to aquire that reward we want.
Most sites pay $40/ref, just ask the site owners via AIM or PM, and most sites has a custom order option where you can get anything. Just divide the cost by 40 and thats how many refs you need. You also round up of course.
my old site, bashfreebieguide.com, lists a lot of prizes and how many refs they are on different sites. i haven't updated it much lately, what with S4N and all. there's another site that i think does the same thing. it's called ultimate freebie list (might be ultimatefreebielist.com, i forget, but i link to it from my website also).