I paid $19,200 for my manual transmission, 2.5L 4 cylinder Frontier S with the preferred package. That package includes AC, radio with CD player and cruise control. Maybe a couple other small things, but no power windows or locks. I also got floor mats, splash guards/mud flaps, and a drop-in bed liner. License and title were extra. No sales tax in Oregon. The automatic trans 2.5L trucks already come with the preferred package which is why their base price is higher.
I'm closing on on 18k miles and it's been trouble free except the driver's window binding up once or twice. It worked itself free before I could get it to the dealer. Flawless performance otherwise. I did change the gearbox oils at 7500 miles and there was quite a bit of fuzz on the magnetic drain plugs. With RedLine MT85 in the trans and it now feeling fully broken in it shifts great.
My thread on the gearbox oil change: http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3812914/2015_Nissan_Frontier,_Rear_axl#Post3812914