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Any old castors from B&Q would do. If they are just pulling in and out, then they don't need to pivot. I made a pull out drawer for toddler crap to go under the sofa using non-pivoting ones. Works fine and reduces the stack height. The pricey ones you saw were probably industrial ones with proper bearings in the pivot part.
I'd have thought this kind of thing
https://www.amazon.co.uk/Castor-Wheels-Rubber-Trolley-Furniture/dp/B07M6PRNHG/260-5057482-5313522?psc=1