The offical provider FramesDirect charges too much for shipping to my country, so the choice boils down to https://widmovr.com/product/oculus-go-prescription-lens-adapters/ or https://vroptician.com/prescription-lens-inserts/oculus-go/. VR Optician is more expensive, but claims to use the renowned Zeiss lens. The delivery time is not a crucial factor for me, but I'm slightly worried by the WidmoVR statement "Attention: due to the current high demand, manufacturing of Prescription Lens Adapters may take longer.". The revues of WidmoVR are quite numerous (they were providing the lens for testing for free) and they are positive, those reviews of VR Optician which I was able to find a rather old and discuss other headsets.
