Flat hoses will always cost more than 50' of a Wal-Mart garden hose.

So Wal-Mart is the way.

....

https://www.pitchcare.com/shop/nelson-rain-train-water-tractor.html

https://www.amazon.com/Orbit-58092N-Discontinued-3-Piece-Sprinkler/dp/B000NJ3R26/

Other ideas