I recently released Advanced MatCap Material on Epic Marketplace… However, it’s not possible to offer discounts on there so I also released it on Gumroad with the discount code RTVFX 
Buy Advanced MatCap Material on Gumroad
What is it?
Matcap textures are awesome! However I found that they don’t work in VR and similar projects that use a free camera. I created Advanced MatCap Material to fix this.
Advanced MatCap Designer
I also created a toolset to allow the creation of custom matcap textures within Unreal Editor - this is also included in the download.
How do I get it?
To buy Advanced MatCap Material and Designer at 50% discount, go here:
Buy Advanced MatCap Material on Gumroad
Alternatively you can get it on Epic Marketplace, which is full price but easier to install to your Unreal project:
Buy Advanced MatCap Material on Epic Marketplace