I took a look at their website and found that they are also known as "custom sawing". When I first started making calls, I tried my hand at box calls. I ordered some box call lid stock from them and was pleased with what I received. Being more of a "do-it-yourself" kind of guy, I used the pieces I ordered more as a pattern to work from than actual working stock.
I noticed that in their kits they include liquid nails glue. If you choose to go with their parts, I would suggest using plumbers goop instead of the liquid nails. After over 2,000 pot calls, I would not use anything else.
The business is owned by a Christian family. They used to include a New Testament in each order.