Acoustic Foam StudioPro | Premium Foam by Acoustic Fields
Amazon.com: JBER Professional Acoustic Foam Panels, Sound Proof Padding Soundproofing Absorption Panel, 12" x 12" x 0.4" High Density Beveled Edge Wall Tiles for Acoustic Treatment,(12P Gray) : Musical Instruments
Amazon.com: BXI Sound Absorber - 16 X 12 X 3/8 Inches 6 Pack High Density Acoustic Absorption Panel, Sound Absorbing Panels Reduce Echo Reverb, Tackable Acoustic Panels for Wall and Ceiling Acoustic Treatment : Musical Instruments
These IKEA-inspired minimal acoustic panels are an aesthetic way to sound-dampen your space! - Yanko Design
Amazon.com: Sonic Acoustics 12 Pack Hexagon Acoustic Panels, 14" X 12" X 0.4" High Density Sound Absorbing Panels Sound proof Insulation Beveled Edge Studio Treatment Tiles (Orange) : Musical Instruments
3 Sound Absorbing Hacks for a Good Night's Sleep - IKEA Hackers