As Ian suggests its worth a root round the used office furniture suppliers to see if there is anything that will do. Some of it will approach Bott, Listra et al in quality and load capability.
Ikea "Helmer" are about half the width you want and somewhat on the cheap'n cheerful side but they are only £30. I have a seriously overloaded, one drawer full of big drills for example, stacked pair. Runner-less drawers are thin and flimsy but whatever works. £10 out of the local free ad rag maybe 15 years ago as temporary solution whist I found something better like Ian's multi-drawers. Which won't now happen until they finally do break.
For bigger items filing cabinets can often be got on free if you haul away terms. Not appropriate for your current needs but worth remembering.
Clive.
Edited By Clive Foster on 24/11/2017 14:22:52