unlocked LG G2 Android Phones on sale for $239.99 with free shipping.
These are the AT&T D800 model so they work best on AT&T and AT&T MVNOs. The D800 can also be used on T-Mobile and does support T-Mobile's AWS band LTE but not T-Mobile's AWS HSPA+ 3G/FauxG. For international use it supports all the common global GSM and HSPA+ bands but not non-US LTE.
If you aren't familiar with the G2, it's last year's LG flagship and is designed to compete with the likes of the Samsung Galaxy S4 and HTC One M7. Specs include a 5.2 inch 1920x1080px full HD screen, 13MP main camera with optical image stabilization, 2.1 MP front facing camera, NFC, a 2.26 Ghz quad-core processor, 2 GB RAM, 32GB internal memory, KitKat 4.4.2 and a 3000 MAh battery for up to 18 hours talk time. The battery is non removable and there's no SD slot, but the big battery and 32GB of internal storage should go a long way toward eliminating the need for either feature. The Google Nexus 5 is based on the G2 but has a smaller screen, smaller battery and a lesser camera.
The G2 carried a $599.99 list price at launch and AT&T is still charging over $400 for it so $239.99 is a great deal.