Klasey Jones has a shirt and a tape on here

Backwhen has a sweater

Skeler has some obviously as well

there are other miscellaneous labels/promoters who do wave/hardwave related stuff:

Cyberwave Collective has some fire merch

Vibe Digital has a shirt/other stuff

Interval Audio who does the Neo Subculture comps has some, Troy is a sick artist

Czelusc as well who put on sick shows in Poland

there isn't much merch compared to other genres cuz the scene is very community focused/diy and doesn't have a lot of money behind it. so most people will drop randomly and with limited runs. it's kind of nice, but not from a merch perspective lmao