I bought 2 transponders off of eBay. $133.00 each + shipping (must be genuine Porsche with code)
Porsche Genuine 996 Targa key remote Boxster 01-04 | eBay
1 Blade $33
Porsche Genuine key blank for 996 986 Boxster Carrera | eBay
The stealership charged me $140 to program both keys (same price for 1 as it was for 2) and $40 to cut one blade (I took the other out of my old key).
Ended up costing me about $470 for 2 keys...which is still robbery!