why not save some money and just make shelves yourself? you may be able to remove the hardware from your current shelves and re-use it for new ones. i buy my kd pine boards from home depot, in the moulding section. nice smooth boards in varying widths, and not too expensive. i think i made 4 or 5 shelves from one board that cost about 5 or 6 bucks.
when i first got Rhino almost a year ago, i revamped his cage with wood shelves, and those shelves are still in use today, although they are getting mighty close to needing replaced or getting a really good sanding. thinking i'll just replace, as that may make it easier to get both my boys living together (the old shelves probably reek of Rhino by now, lol!).