IF DIY is OK and the cinder blocks and wood shelves ain't gonna do it for you - google Flexi racks. I built one in 1993 I am still using, and another smaller one in the last 10 years or so for my media closet.
Threaded rod and hardware easy to come by from local supply store. Wood panels can be MDF through anything you can think up.
My earliest version (pre internet so I pretty much HAVE to have invented it...

) was 3 2x6's laminated together to build 24 inch wide shelves. Drilled the holes for the threaded rod and assembly is simple - and easy to raise and lower sections in the future as gear sizes shift around.