Hello Brian,
Yes, the big truckload would be much less expensive. The best alternative I've found is getting a truckload at a time and emptying directly into my raised beds. It saves on your back and I think it's a better deal. They also have compost mixed with washed composted manure. I've been using it, and I can really tell the difference. Also, if you have the option of a truck at a time, ask if they are still giving out frequent user cards. Get 10 loads and the 11th is free.
Teresa

Brian,
I agree with Teresa to get a bulk load of compost more than you think you'll need really because it will shrink especially if you plant in straight compost. If you don't have your own soil to mix with it you could get a load of top soil to mix in.

To save $ you could use some of the free horse manure advertised around the south end as well as lasagna layers of compostable materials. Build your own compost pile for your fall use or you put at bottom of your boxes if not hot manure, but not fully composted then top with the finished compost/soil mixture you create.

Expect shrinking as the compost decomposes. I'll post what we did on the NWGardening forum instead of here.

Corrine