Books on the Knob has a post with a
full list of Hugo Award nominations and prices/freebie links, if applicable.
Also, if you spend about $50 US/$70 AUS, you can get all the stuff in a single package directly from the Hugo committee, mostly in PDF format, and have voting privileges to boot. But apparently they're kind of slow in processing things.
ETA: Huh. It's also $50 CAD for Canadians. Awesome. I was wavering, but for this price and no currency exchange fees for a full bundle of award-nominated works, I think I'll splurge.