Ikea Kallax units 2x 2
This item is in Great Rissington GB
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These are very robust storage units, with 4 'slots' in each, and are 77cm square. I have 2 of them, both with 4 storage bins to go into the slots. The units (when new) cost £29 each, and the storage bins are £3 eah, bringing the total cost to £62, but you can have them for £20 for the pair. (These ones are not disassembled!)