At the moment they just sell the screw on bendy bridge with these two small ledge shelves for £12.99. But those little ledges are nice too - I've used those to make steps before
The wood shelves came from there as well a couple of years ago. They used to sell a shelf pack with various sizes of shelf. Limited supply of those right now as well due to this virus situation.
https://www.ebay.co.uk/itm/Two-6x4-s...72.m2749.l2649
The whole cage upgrade thing was partly because I am swapping the Plaza for the Barney (someone is picking up the Barney next week) and partly as a treat to myself after a difficult patch recently. As well as Pickle growing large and I thought he'd appreciate the upgrade. Retail therapy and setting up cages helps - but I probably spent a bit too much. Luckily I had most of the cage items already.