That's mostly thanks to a torrent of killer deals and discounts offered of late by the handset's manufacturer, as well as third-party retailers ranging from Amazon to B&H Photo Video, Walmart, and of course, Best Buy. The latter has the unlocked Moto X4 on sale yet again in a heavily marked-down bundle alongside an LG Fiesta 2 phone, a Simple Mobile SIM card kit, and a $50 Simple Mobile prepaid phone card.
The first thing you'll want to do is add the X4 to your cart after choosing to activate it "later", followed by the Simple Mobile SIM card kit and prepaid phone card, which would typically set you back $51 by themselves. A free LG Fiesta 2 will be thrown in by Best Buy without you having to do anything else. All in all, you'll be paying a measly $125.99 for two Android smartphones and the only two things you need to get 30 days of Simple Mobile service with unlimited talk, text, and high-speed data.
Keep in mind that you can take the Moto X4 to whatever carrier you want (including Sprint and Verizon), while the LG Fiesta 2, which is a fairly modest handset... with a gargantuan 4,500 mAh battery on deck is exclusively compatible with T-Mobile MVNO Simple Mobile.
Naturally, this is the 32GB variant of the X4 we're talking about and not the 64 gig model, packing 3 instead of 4GB RAM, which is still a very decent setup for such an incredibly low price.