If you're looking to save a hundred bucks or so on the powerhouse Optimus G from LG on either AT&T or Sprint, Amazon Wireless is the place to be. The company just dropped the price of the device for both carriers down to $99, which is a fairly substantial savings for such a high-end device, especially compared to the $199 that both Sprint and AT&T are asking.
For those who may not be aware, the Optimus G has the same hardware guts as the Nexus 4:
Processor: Qualcomm Snapdragon S4 Pro APQ8064 quad-core at 1.5GHz
GPU: Adreno 320
Network Compatibility: AT&T: GSM quad-band with LTE, Sprint: CDMA with LTE
Operating System: Android 4.0.4 with Optimus UI 3.0
Display: 4.7" TrueHD IPS+ 768x1280 (320DPI, 15:9)
Memory: 2GB RAM / 16/32GB storage (depends on model)
Cameras: 1.3MP front, 8/13MP rear (depends on model)
Battery: 2100mAh, non-removable
Ports / Expandable Storage: microUSB / microSD (AT&T model only)
As noted above, the big difference between the two is in the area of storage: the AT&T model comes equipped with 16GB on-board, as well as a 16GB microSD card; whereas the Sprint version has 32GB with no microSD card slot.