If your project needs to use many FSRs, making your own surely reduces the cost of your project.
What you'll need:
Copper PCB ($7ish from radioshack)
Conductive foam ($7+shipping from altex. $13 total)
Step 1: Cutting
A manual shear was used to cut the copper squares and regular pair of scissors for the foam.
Step 2: Soldering
You need to do this for each piece.
The copper PCB is perfect for an sturdy solder.
Step 3: Sandwich
Cut a 2.5" strip and wrap it around, then cut any excess.
And you are done!