replacing the car stereo?

I am considering buying a used 2002 Prius in fairly good shape. I was dismayed, however, to discover that in 2002 Toyota still thought people were using cassettes instead of CDs? I installed a new Alpine car stereo with a removable front plate, CD player and iPod hook-up in my current car (a 1988 Celica, inherited from my grandmother) - does anyone have experience doing something similar in a Prius? It doesn't look like a compatible space, but I figured it was worth asking...