I'm going to make the Bavarian cream recipe from this website but it calls for pastry pride and I've never seen or heard of it! If it's something I can't find, does anyone have a good vanilla pastry or bavarian cream recipe? I'm not finding much on here. Thanks!

It is a non dairy whipped cream so you can sub 1/2 & 1/2; or heavy whipping cream.
Don't know where you live but it should be available at a Gorden's Food Supply (GFS). Try google to see if there is such a store near you.