We found a 6″ digital caliper that is priced at about $12 over at Amazon. While we strongly prefer quality calipers over ones like this, cheap digital calipers are definitely better than no calipers.
Included are the caliper, two batteries, and a storage case. The tool seems to be well reviewed – out of 54 reviews, 32 give it 5/5 stars, and 14 rate it as 4/5.
The caliper is eligible for Amazon’s free super saver shipping on orders over $25.