Reddit mentions of Stake Line Winder, 50# x 500 ft. - Spool color may vary

I run a kite shop here in Atlanta and can tell you that the main difference in pricing has to do with quality. Premier Kites makes some cheaper, but good quality general kites....but I would suggest looking at Prism or HQ. Both have excellent kites, but I prefer Prism for their single lines and stunt kites, while HQ is amazing for their foils (power/speed kites).

Prism has a great Stowaway Delta that we sell a ton of at our store, they retail for about $35. I highly suggest these for people looking for a single line that is of great quality and not very expensive. It comes with everything you need all in a great package. The kite folds up nicely into the bag, and the flying line hooks right into the bag as well.

We also have carried that same line winder you linked and I can tell you that its okay for light flying, but if you have something that has a bit of a tug on it and your not paying attention, the handle that you wind the line in with can slip out of your fingers and start turning really fact and do a number on your hand. I would suggest either using what comes with the kite you purchase, or opt for something like these. They are classics, and they even come in a wooden version but for some reason I dont see theirs listed on Amazon. Anyway...just some suggestions, hope I've helped some!