CrossedSignals

The closest thing I could find to answer your question: http://www.nextel.com/phones_plans/states/florida/phones.shtml

The ETF at the time was $200, so rough guess is 200 over retail price for ' no contract ' price.

I should have mentioned that I transcribed that statement from a vzw commercial that ran on the Esquire network this evening. I did see the the statement "prior to December 5, 2013" referenced in the same commercial. The next frame of the commercial contained the statement I quoted.

For reference, it's the commercial where several people are asked and the "correct" answer queues the band to burst through the illustration of the carrier maps. The maps appeared to match the ones in (edit: post 22).

The caveat on Verizon's commercial is: "based on indoor and outdoor testing using smartphones of national carriers' 4G LTE from January-June 2013. Based on July 2012 U.S. Census data. Verizon's 4G LTE service is available to more than 305 million people across 500 markets in the U.S."

Obviously they chose a very favorable set of circumstances that don't take into account for recent launches and favor the propagation/building penetration of 700MHz.

A late reply to this topic, but in case the OP is still looking for a booster, Wilson introduced a new 'all band/all air interface' booster at CES: 

http://www.wilsonelectronics.com/uploads/files/229_Wilson_Announces_DT4G-FINAL-FINAL.pdf

http://www.wilsonelectronics.com/store/display/243/45/dt-4g-coming-soon

Downfall is that it's a small space/single room solution (gain figures 23.7dBm to 24.9 on the uplink and -1.0 to 6.1 on the downlink) and it doesn't cover band 41 (25 is covered and most of 26)

Looks like a nice phone at a very good price.  From the Motorola web site, it looks only the global GSM and U.S. GSM are currently available (the original U.S. Release date was in January but they've since moved it up --looks like by offering a variant of the global GSM model).  A little disappointing that its HSPA+ 21 only.

I hope that the CDMA version magically acquires LTE before release in January but am not hopeful.  There would be little reason to choose the Moto X over this (unless you want customization).

A great kids phone or a phone for someone who isn't too concerned about data speed.

Try www.solidsignal.com.  They have a pretty good selection of Wi-Ex and Wilson Electronics boosters.

Also might want to try eBay for used equipment. 

I read the quoted reply a couple of times trying to figure out why they would put a timer on BYOD activations.  I can only guess that they (Sprint) want to prevent someone from signing up for the latest and greatest phone, cancelling service, paying the ETF and then immediately taking it to Ting.  Given the potential cost savings, the break-even point for some (low data use) customers moving to Ting is quick.

It will be interesting to see if they do indeed do the same with the Nexus 5, especially if the phone is not offered directly for sale by Sprint.  Given that the Nexus 4 purchased from T-Mobile was in no way a deal vs. purchasing direct from Google, I speculate that the N5 may only be offered for sale by Google and therefore the beginning of a real effort to drive BYOD handset sales.  Also, if the rumors are to be believed, the N5 may be the first handset to cover all of the LTE bands utilized by T-Mo, Sprint, & AT&T.  A 'network agnostic' device would be ideal for a BYOD centric model.

It appears that the SoftBank/KDDI support embodied in iPhone 5c/5s models A1456/A1453 is for bands 1 & 8.  On the whole these two SKUs appear to have decent global roaming capability (if Sprint enables).  The notable ommissions are Band 7 for Europe and Band 28 for Oceania.  Otherwise, it covers the most pervasive LTE bands worldwide.

See:  https://en.wikipedia.org/wiki/List_of_LTE_networks and https://www.apple.com/iphone/LTE/ to cross-reference which band is for what operator.