I ordered this one off amazon this time last year:

VINGLI Aluminum Solar Swimming Inground Pool Cover Reel Set, Up to 18-Feet Wide x 40-Feet Length https://www.amazon.com/dp/B01MDLU2GG/ref=cm_sw_r_cp_api_i_ji0nDbESGKB8Z

Has worked great so far. It was a bit of a pain to put together, but has held together well. Even the straps all stick still, even after falling into the pool during high winds! It’s easy to wind up as long as you do it slowly so it rolls evenly. Keeps the pool much warmer and noticeably stops evaporation.