Shelving Units for stacking PVC cages

Hey all,

I am having some trouble looking online for Shelving Units that can hold multiple PVC cages. I have one 4x2x1 atm that is occupied, and I plan on ordering two more, but they wouldn't be the same size (bigger probably) as the one I have currently. I plan on going out to Home Depot and Lowes tomorrow, maybe Walmart but I guess maybe if someone could point me in the right direction or provide some links that would be great.

Thanks!

Bakers racks. I have a 4 shelf that is 8 foot tall, 6 foot wide and 2 foot deep.
I got mine from Ace Mart, a restaurant supply store close to me.