Acoustic Foam Panels, Recording Studio Acoustical Treatments Foam Panels – 2 Inch Thick 12X12 (24 Pack) | Sound Observing Soundproofing Fireproof Wall Foam Tiles | For Studio Office (Black) | Reverb
Focusound 50 Packs Acoustic Foam Panels Wedge Soundproof Studio Wall Tiles Sound Absorbing with Double Side Adhesive Tape, 1" X 12" X 12" - Newegg.com
Sonic Acoustics Acoustic Foam Panels - Pyramid Recording Studio Wedge Tiles - 2 inch x 12 inch x 12 inch Isolation Treatment for Walls and Ceiling (12 Pack, Black)