Or if you got a refund for the Rosewood cage you would only need another £4 for an Alaska cage
Or £14 for a Barney cage.
If you really want to make a bin cage though, you'd need something of this kind of size for a Syrian really.
Go Shopping - Really Useful Boxes - 145 litre Really Useful Box
Another option - if you have the space for it - is a detolf hack. Costs £40 and you make a lid out of strips of wood and mesh (a bit easier than a bin cage in my opinion).
https://www.google.co.uk/search?q=Ha...j1BZ0Q_AUIBigB
DETOLF Glass-door cabinet Black-brown 43x163 cm - IKEA
The only thing there is it needs something to stand on really - like a couple of 4 x 4 kallax cube storage units or a couple of Ikea lack tables, which adds to the cost - unless you have something to stand it on.