Tractorsmart seems to be holding their prices ok. Most of the local farmers around central Missouri swear by WIX filters and Shell Rotella T oil for their diesels. Both are readily available in most Ag areas, and Wix has a website that will cross reference nearly every number. I don't know who makes filters for Kubota, but WIX is probably the highest rated HD filter made, and they cost less than Kubota. I am going to switch when I run out of my stock of K filters.