YOU may find its cheaper to just get new material. I had quite expensive blinds installed 5 years ago and when looking to get them replaced was told 'it wont be cheap' by the supplier, I popped out to a company that makes a lot of these blinds out near clondalkin, spotted the same material in rolls in their warehouse, gave them measurements and they cut them to size for me. May seem a little extreme but its always nice to get a better deal