Office Depot and other large stores with writing supplies have a type of mastic that is very similar to BluTack, but much less expensive. I have used it and it makes an excellent substitute for about 1/3 the cost.
I picked a substitute up as well that was light blue in color and under $2.50 a pack at our local mom and pop hardware store. It doesn't stain (even old unprotected wood)and was enough to make at least 20-24 pea sized balls. If I find the package I will post the brand name.
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