Brunos Parrot Warehouse Wholesale Pet Suppliers
Email these guys.
I asked if they had the newer shelves (which they don't) but he said they still have the old shelves and ramps available seperately. It may seem a little expensive but it's the only place I could find and that Savic reccomended. £14.99 postage is £7.50.
He didn't say if postage was on top of the £14.99 or included.