From shelving.com I bought
With a discount, the price (2018) came to about $75. Very reasonable. Each shelf can hold, they say, 800 lbs.!
I feel like I'm in a 50s diner now and every time I reach for a knob, feel like I should be reaching for a slice of pie. :-)
The foot print is about as small as you can get and with the wire mesh, ventilation is not an issue.