I recently had someone round to fit a new Aerial to the exterior of my house (previously I had a makeshift Aerial propped up in the loft) Just after he left I noticed that he had left an empty coaxial cable reel next to my dustbin.
Great I thought I shall use it a a filament dispenser. Now all I have to do it attach a spindle so that it can rotate freely. I was lucky to get hold of one for free, I guess the only way someone else could get one is to buy some coaxial cable