As one of its daily deals, Best Buy offers Killzone: Shadow Fall for PlayStation 4 for $19.99. Opt for in-store pickup to dodge the $3.99 shipping fee. That's $4 under last month's mention and tied as the lowest price we've seen for a new copy. (It's also a current low by $10, outside of the mention below.) Deal ends today.
A close price: Amazon has it for $20.86 with free shipping for Prime members.