Replacement parts for Quik Shade instant canopies are available from QuikShade.com and eBay as of 2015. Quik Shade has the larger selection. Since Quik Shade is the manufacturer, it is well equipped to answer questions about parts selection and installation.
Quik Shade lists the model and year the part is compatible with for some replacement parts. Items listed on eBay are sold by third parties and subsequently can be new or used. Quik Shade offers online manuals in PDFs to identify parts and aid in installation. EBay has a search function for locating parts, but the quality of results is dependent upon the information provided by the sellers.