I also saw the Barnstable Probate page -- obviously focused on current events, not historical research. I have the NEHGS people working on something else for me -- you're right, they are a tad expensive, but good.
Somehow I never thought of the Mass Archives. Doh. They've been helpful in the past - checking with them.
Most helpful of all -- I didn't know about the LDS copying service. Great idea. What's more -- when I checked their catalog earlier, I didn't find those Barnstable items. In retrospect, I must have been looking at the town rather than the county. Grrr.