This is ringing a bell now. I am pretty sure I did not pay for my patch kit. I did have to buy the glue myself though. When I got my cover installed, they gave me a bag to store the cover in during the swim season. The bag was made out of the same material as the cover. If you have the bag and are not using it, you could cut the bag and use that as a patch.

Cut a round patch for the top and bottom of the hole and glue it on with the Goop.