Ahh, this is the kind of moment we feel like it really DID make sense to buy a Honda Element. We went to Lowes and Home Depot for the various supplies we needed (Lowes wouldn't cut the lumber even though they sold it, claiming their saw wasn't right for it, but Home Depot was happy to help).
To make 4 raised beds, we bought:
-8 2x12x8 untreated boards
-3 2x12x8 cut in half lengthwise
-1 2x12x8 cut in quarters
-16 stakes to brace the longer sides
-1 bag of birdfeed
At the end of Sunday, the sun went down before we could finish building the beds, but we had one completed and the birdhouse filled and up. Over the past week we have been building the others in the garage since it has been raining outside.