I don't know of a wooden one for under $100.
You could probably enlarge the barrel channel in the factory stock. I believe some of the tools
Brownells sells for bedding *may* work.
Now, the only problem I can see is this.
If its the BASIC stock, you probably WON'T be able to put the barrel band back on with a larger diameter barrel.
If you can get the DELUXE stock then this may work as it does not use the barrel band.