Depending on how you want to go - you can engineer a system pretty easily for this boat on the cheap, especially if you don't mind bag launching.

I beat the bushes and found a good condition used sail. Sailor friends had spare windsurfing masts (fiberglass) they unloaded for the price of free.

A hand full of 1/8" spectra for bridles, a couple of blocks, and there was fun. If you're interested I can provide more details.