MicroCenter has it.
http://www.microcenter.com/product/465932/303_ATX_Mid-Tower_Computer_Case_w-_Glass_Side_Window_-_White
I had to buy my Dark Base pro from amazon.uk, luckily at msrp price.
Inwin 303,
Thermaltake commander,
Deepcool Dukase v2,
Phanteks Evolv & luxe,
Silverstone Raven RV02-E
- Just some of the white cases I know off the top of my head.