Command station with the "stomp rack" for the top tier, and 3 "nano shelfs". With shipping it cost me about 500$ when I bought it about 5 years ago.

SPECIFICATIONS:
Size: W 650mm x D 590mm x H 780mm
Max Size between uprights: 600mm
Max recommended base keyboard: W 1000mm x D 400mm* H 200mm
Max recommended 1st tier keyboard: W 1000mm x D 300mm X H 150mm
Max recommended 2nd tier keyboard: W 600mm x D 300mm x H 150mm
3U 19″ rack mounts
Max recommended 3rd tier units x 2: W 300mm x D 200mm x H 60mm
Max load weight 1st tier: 10Kg  Tilt: 30 degree down
Max load weight 2nd tier: 5Kg  Tilt: 30 degree up or down
Max load weight 3rd tier: 3Kg each