Amazon! And yeah they can be sound dampening but not as good as foam ones. Art3d Decorative 3D Wall Panels... https://www.amazon.com/dp/B09NCZ3YKW?ref=ppx_pop_mob_ap_share

They're pretty cool, worth it. I got the panels from Amazon, here's a link:

https://www.amazon.com/Art3d-Decorative-Panels-Diamond-Design/dp/B09NCZ3YKW/ref=mp_s_a_1_3?