Cheapest option would be to use a Nzxt Kraken G10, this bracket will allow you to use an Nzxt or Evga All in one cpu cooler to replace your failing hybrid cooler. the bracket is like $30 and then its cost of what AIO cooler you use. You have to use a cooler that is supported by the the bracket
Hope this helps you
(check list)
NZXT : Kraken X61, Kraken X41, Kraken X31, Kraken X60, Kraken X40
Corsair : H105, H110, H90, H75, H55 , H50 (CW-9060006-WW only)
Antec : KUHLER H2O 920V4, KUHLER H2O 620V4, KUHLER H2O 920, KUHLER H2O 620
Thermaltake : Water 3.0 Extreme, Water 3.0 Pro, Water 3.0 Performer, Water 2.0 Extreme, Water 2.0 Pro, Water 2.0 Performer
Zalman : LQ-320, LQ-315, LQ-310
Here's a link
https://www.nzxt.com/products/kraken-g10-black