GIK alternatives

I recommend Acoustic Design Works. Got two 2" absorption panels covered in fabric, 24 inch hexagon, for only $107 plus the shipping, which was reasonable.

I do like the GIK diffuser/absorption combo panels that I've seem on their website. They are pretty nice looking and available in several finishes and designs/patterns. 

Only good experiences with GIK. Shipping has gone up for everyone. Last time I ordered was previous to the supply chain issues and I had to wait a couple of months. I made many of my panels, but utilized GIK for the low frequency absorption such as bass traps. For the DIY panels I ordered the Guilford of Maine material from GIK as they had the lowest prices. The design of wood covering over the acoustic material is lovely. I was going to move some from the home theater room to my two channel room, but my spouse protested as she likes the way they look.

You can also check Vicoustic i find them very good & have ordered a few .
I too found GIK a bit too expensive comparatively .

Yeah, Vicoustic Multifuser DC2 for diffusion. Absorbers are easy to do DIY; just cut a 2’ x 4’ sheet of 1/2" ply into four 6" widths, make a 4’ x 4’ frame and fill it with Owens Corning 703, cover with grill cloth. Easy peasy.

Audimute