Here's the link: http://iptvprivateserver.com/
I have Kodi installed on a FireTV. I went to pay and it asked for an optional MAC address, I gave the one from Settings on FireTV and it said that my MAC address was invalid.
Edit: http://ftazeta.com/kodi-xbmc/70820-kodi-iptv-stalker.html#post395331
So there are two options basically, one is use nfl2go.com which is $29/year and only accepts Bitcoin (huge plus for that one! as I don't have to trust them).
The other option is to use a VPN/DNS provider that allows you to geo-dodge, and signup for the real NFL GamePass (be sure you signon to your VPN before ordering...otherwise you will get GameRewind).
I use Kodi, and the drawback is nfl2go hasn't released their kodi addon yet (supposedly in development according to their blog). I have emailed help@nfl2go.com several times this summer asking to help and never had a reply. Not very confidence inspiring. But I did use it last year and it worked fine in the browser.
This is an NFL GamePass addon for kodi: https://github.com/Alexqw/xbmc-gamepass
I suggest you file any bugs using the Kodi Log Uploader.
Last seasons archived games seem to work ok, occassionally it bugs out. I could not however load any archived RedZone streams...so this is a concern as I usually watch RedZone on Sundays.
When you're purchasing NFL GamePass you can try all the exchange rates (top right menu) -- I found paying in Brazillian dollar gave me the best USD price of about $173 (down from the $199 they ask).
I should say there are 3 options...you could watch a degraded quality stream using SportsDevil for free.
If you go under RojaDirecta in SportsDevil you'll see live games and there are some acestreams in there that have the NFL games....these are very high quality (HD).