Assuming you are talking about "day/night shades", yes they are repairable. You can get 1 mm "Warm Window" cord at most fabric stores. I have repaired three of them. Do not remove the old cord without being certain you can restring it with the new cord. You will never be able to figure out how it was threaded originally. There are also those who will do the job for you. The latest prices I have seen are $15/ shade.
2003 Dolphin 5342, W-22 Chassis, 22.5" Tires w/a spare, Monroe Shocks. Ultrapower ECM Upgrade.
2004 Toyota RAV4 toad, 2wd, 5 speed. US Gear toad brake.