If you need a good unlocked phone on the cheap, you might be tempted to pick up a Moto G or a Nexus 5, but this deal on the LG G2 is something to consider. This device is unlocked with US GSM/LTE bands and 32GB of internal storage for just $240.
Even though it's coming up on a year old, the G2 has solid specs. You're looking at a Snapdragon 800, 2GB of RAM, and a 5.2-inch 1080p LCD. The 3000mAh battery will keep it running for a long time too. The G2 is on KitKat these days, but the UI is a bit behind what you'll get on the G3.
This is a refurbished device, so you're taking a small risk. The seller promises to accept returns if it's busted, though. Shipping is free in the US and there's no sales tax, unless you're in California. Note: The D800 likely doesn't support T-Mobile's AWS HSPA bands, so you'll need to be in a 1900MHz re-farmed area to get 3G/HSPA+.