The dubble-sided tape i showed in an earlier post is a good deal. I bought it and it lasts for a long time, it comes in 2 sizes 3 mm and 6 mm, the photo is of the 6 mm roll. the lenght is 50 m = 164 feet. the price for one of those rolls are 25 kr which is app 3,5 dollars. it can be ordered from the online scrapstore scraplagret. their terms and conditions in english for international buyers.
If u need any help with interpretation with swedish just ask me :).