I was just looking yesterday at my turning tools and thinking how few tools I actually need to make a duck call. I use a 1 inch roughing gouge to turn a square blank to round, a Crown brand Skewchigouge, a 1/8 inch cut off tool and a 1 inch skew chisel. That is all I need to "turn" a barrel and insert.
Don't get hung up on buying tools. Get the few you need, learn to use them and learn how to keep them sharp.
Fred