Sunset 3rd Raill GGD diesels are not into the 4 digits. When done in the typical size runs, they are between 650 and 700 - significantly under 4 digits.
For the example the current Atlas O F2/F3 is MSRP 519.95 and the currently announced Sunset F3 is 669.95 which is a difference of $150. 150 is significant, of course but to get features we want, it may be worth it to some.