StackSocial has the certified preowned, LG made Google Nexus 5 16GB phone for freemium Sprint MVNO FreedomPop on sale for $199.99 with free shipping now through May 5th, while supplies last. That's not a bad deal as used Nexus 5s are currently going for $230 to $300 on eBay.
The Nexus 5 features relatively high-end specs including a 2.26 GHz Qualcomm Snapdragon 800 processor, 8 MP rear-facing autofocus camera and camcorder with LED flash, 1.3 MP front-facing camera and camcorder, Android 5.1 (Lollipop), 5 inch, 1080 × 1920 screen, 16 GB of internal memory and 2GB RAM. The Nexus 5 is SIM unlocked and the bootloader is unlockable.
All US market Nexus 5s are identical. They support the followung bands: GSM: 850/900/1800/1900 MHz, CDMA: 800/850/1900, UTMS/HSPA: 850/900/1700/1900/2100 and LTE bands 1/2/4/5/17/25/26/41. That means the Nexus 5 supports Sprint Spark tri-band LTE (LTE bands 25,26 and 41) making the first Sprint Spark phone sold by FreedomPop. With the way Sprint has screwed up its Bring Your Own Phone program for MVNOs, it's safest to buy a phone sold for a MVNO rather than hope that a used Sprint phone will work.
Like all phones on FreedomPop, the StackSocial Nexus 5 comes with 500 MB per month of free data, which can be easily increased to 1000 MB with FreedomFriends. It also comes with a year's worth of FreedomPop freebies including unlimited talk and text, visual voicemail, tethering and usage alerts. These are all of dubious value; the free talk and text is only with using FreedomPop's VOIP app - I find Hangouts does a better job for free. Just be sure to cancel the free features before your year is up or you will be charged $17/month for these add-on services beginning with the 13th month.
If you don't want to use FreedomPop, the unlocked Nexus 5 should also work on AT&T, T-Mobile, Sprint or any of their MVNOs. The one reservation I have about this deal is that these phones are up to 18 months old and the non-removable battery is likely starting to show signs of age. Fortunately, replacing the Nexus 5 battery doesn't look too hard.
Image: FreedomPop Forum
Related: Prepaid Operator Profile: FreedomPop