I want to update this as it looks like the free section in Experiences has been removed for the Rift and cant see it for Quest either, Gear VR store still has a free section. Also when searching filtering from low to high you will only see paid apps starting with the lowest price at $1. The free programs are listed at the end after the highest priced items so you need to scroll through everything in the store just to get to the free stuff.
This seemed to have happened in the last month or so. Oculus has made it extremely hard to find all the free content now pushing users towards the paid content by hiding the free stuff..
Yeah real nice to hide all the free games, i dont mind paying for games but like i want to build my library without spending money of every single thing.
Up until now, to find anything outside of the Oculus app, you pretty much had to manually Google search 'Oculus' + 'the name of the game'. To find every free game, simply type 'free' into the search field. A filter menu also lets you find all games currently on sale including their original price and new sale price.