Blu-Tack where to Buy?


Anyone know if Blu-Tack is available at the bigger Office Depot type places?? I live near San Francisco.
128x128justlisten
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.