Have had a pretty good experience with these over the past year:

RYB HOME Soundproof Curtains 84 inches - 3 Layers Blackout Curtains Noise Cancelling Thermal Insulted Drapes for Door Window Living Room Room Divider Curtains, W 52 x L 84 inch, Gray, 1 Pair https://www.amazon.com/dp/B083467LR8/ref=cm_sw_r_cp_api_i_Q07WEP07BKN82GKSVBKM