B&H Photo-Video offers the Unlocked NVIDIA Shield 8" 32GB 4G LTE Android Tablet, model no. 940-81761-2500-100, bundled with a NVIDIA Shield Wireless Controller, model no. 945-12570-2500-000, NVIDIA Shield Tablet Cover, model no. 930-81761-0641-000, and $30 B&H Photo-Video Gift Card for $399.99 with free shipping. Assuming you'll use the gift card, that's the lowest total price we could find for this bundle by $38 (outside of the deal below). This GSM tablet features an NVIDIA Tegra K1 2.2GHz quad-core processor, 8" 1920x1200 LCD, 32GB internal memory, 802.11n wireless, 4G LTE, Bluetooth 4.0, and Android 4.4 OS (Kit Kat).
Don't want the gift card? Amazon offers the same bundle along with Half-Life 2, Half-Life 2: Episode 1, and Portal for Android for $399 with free shipping. Aside from the deal above, that's the best deal we could find by $37. Note that although Amazon says it is for AT&T only, buyer feedback says that it unlocked for GSM carriers.