Rocky is cheapest I have seen to date, $3.97 from Walmart as well:
https://www.walmart.com/ip/PAW-Pa…/688911959
Also this Rubble vehicle is on sale, however it is not part of the Ultimate line:
Paw Patrol – Rubble’s Steam Roller Construction Vehicle with Rubble Figure
https://www.walmart.com/ip/Paw-Pa…/903538233