Because Sony is strict about file sharing, you won't find these on the PlayStation Store. You need community repositories.
Top 3 Trusted Sources:
CUSA Codes are Critical. If you have the Handsome Collection (which includes TPS and BL2), your CUSA code is usually: Borderlands Pre Sequel Modded Save Ps4
Downloading a save for the wrong CUSA will result in a "CE-33116-4" error. You cannot fix this without Save Wizard. Because Sony is strict about file sharing, you
Some poorly made modded saves inject "garbage data" (invisible, bugged items). This can cause your save file to balloon from 5MB to 50MB, leading to longer load times or crashes during the Sentinel boss fight. CUSA Codes are Critical
If you have a PC copy of TPS:
Yes, PC cross-save works with PS4 for TPS — but only if you own the game on both platforms (or use a friend's PC copy briefly).