Republic's plans range from $5 per month to $40, but you don't get very much on the low end of that price range. For $5 per month, you can make calls over Wi-Fi; your phone won't have any outside service--no voice, text or data--when you're not on a Wi-Fi network. For $10 per month, you can make cellular calls and send text messages, but you still don't get cellular data.
Republic's higher price tiers are much more useful. For $25 per month, you get unlimited calls, texts, and 3G data. The $40 per month plan adds 4G connectivity. Even in these cases, Republic routes phone calls and text messages over Wi-Fi when possible, which is how the company keeps its prices low.
Most wireless carriers are now charging $100 for the Moto X on a two-year contract, so Republic costs a lot more up-front. But with most major carriers' plans costing upwards of $70 per month for voice, text and data, you'd make up the difference in seven months at most.
The Moto X is a solid phone as well. It has some smart software features such as hands-free voice commands and notifications that display automatically as you're taking the phone out of your pocket. It also runs a nearly stock version of Google's Android software, avoiding the kind of bloated features you get on other Android handsets.
On the downside, Republic Wireless's version of the Moto X only comes in black or white, and you can't trick out the phone through Motorola's Moto Maker Website.
If you'd rather stick with a big carrier and sign a two-year contract, Verizon now sells the Moto X for $50--half the price of AT&T and Sprint--through its own website and through Moto Maker until November 18. T-Mobile still charges the full $500 price for the Moto X, so if you're looking for a fairly clean Android experience for less on that carrier, go with the Nexus 5 or wait for the $179 Moto G.