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Duct tape

Duct tape Ace Professional 

This is for use for things such as holding polystyrene sheets in place while the glue dries.

It costs about $7 for a 60 foot roll.

http://www.acehardware.com/product/index.jsp?productId=3706787&cp=2568443.10768931.1253350.1256370.1923035.1254888.1305112

And a slightly bigger roll for about $9.

http://www.acehardware.com/product/index.jsp?productId=1273399&cp=2568443.10768931.1253350.1256370.1923035.1254888.1305112