If you have a Lowes home improvement store close to you, go there. In the power tool section, you will find different polishing compounds (sticks) near the cloth buffing wheels etc. Buy the white one for 5-6 bucks. Will pretty much last you a lifetime. Its 2-3 times the size of the Tandy stick, and probably both come from the same manufacturer.
The white is what you want for basic stropping like swivel knifes etc. If you are sharpening finer edges, the green is the way to go.
Hope this helps.
Chuck