Gatling Gears (twin stick shooter set in the greed corps universe) was lately permanently reduced from 1200 msp to 800 msp to match it price on the PSN.
...but who knows what discounts lurks at the heart of the marketplace ? The Shadow knows (moahahahaha!) Ok, some might not be that old to get this. Anyway;
has experimented a 50% off price reduction so you can grab it now for 400 msp
(bioshock 2 DLC) has also being discounted quietly from 800 msp to 400 msp
It's unknown how long will those discounts last so those interested take advantage while you can!
Thanks to PunkyLiar and Illum1na for the info!