Hardly ever book with Pricline so not sure if this is new
Booked 2 reg ticket (not Basic), allows me to choose the standard no cost seats, at check out page I noticed they add on a "convenience fee" of $14 for seat reservation, which is non refundable in the 24 hours. It doesn't warn you or tell you about this "fee" until the checkout page under one of the line items. Sure enough when I tried without choosing a seat it doesn't charge you this convenience fee, and just go to the airline and pick your reg standard no cost seat. (there isnt even an option to "skip seat selection" etc making you think that you need to pick a seat (which shows as $0 cost), you need to click continue without touching a seat")