Go to DigiKey's home page, type multipliers, click on search, and select analog multipliers. The prices will refresh you.
But....
Multiplying is the process of repeated addition. Why not add up everthing greater than 127 (or 128) and subtract everthing below that figure. keep track oh the total, it will be in (turn-rate)*seconds, but the time will be in 26 ms units.
If you actually need to know the heading in degrees, let the Stamp multiply (or divide) this total for you.
Think of it as digital integration. Or is that integer-ation
.