I got mine off amazon. I have a 2014 double cab

Tyger Auto T2 Low Profile Soft Roll Up Truck Bed Tonneau Cover for 2007-2020 Toyota Tundra Fleetside 8' Bed TG-BC2T2085 https://www.amazon.com/dp/B012BVIAI4/ref=cm_sw_r_cp_api_i_cCs8Eb18P02M2

It’s worked out perfect for me. Easy to roll up when I need to, easy to roll down. It also “locks” and can’t be opened without opening the tailgate. Won’t stop anybody with a knife but if you lock your tailgate, it offers some security