From Kia website:
CASH OFFER
2018 Stinger
$1,000 Cash Back
$1,000 Bonus Cash [1]
2018 Stinger
[1]Bonus Cash from Kia Motors America, Inc (KMA).Must take delivery from a participating dealer and from retail stock from 11/1/2018 to 11/30/2018. Bonus Cash offer when you purchase or lease a new 2018 Stinger (3.3L V6 Turbo, Automatic Transmission, AWD) OR (2.0L I4 Turbo, Automatic Transmission, AWD) and
may be combined with cash incentives or finance and lease offers from Kia Motors Finance. This incentive is a limited time offer on eligible Kia vehicles. Not all incentive programs are compatible. See dealer for details.
I dont know about the regional question. P.S: Cash back, and bonus cash appear to be the same thing, not double (lol).