I have found some very old red/blue glasses that I got with National Geographic ~ 15 years ago. I have tested them with reshade and results are amazing, better than expected.
Now I am searching for something better but it seems that all recommended glasses (recommended here and in relevant FB groups) can be bought only in US which would mean that I would pay ~ 6-7$ for glasses and more than 20$ for shipping costs.
Does anybody know where I could order them in EU?
and also 10€ for taxes. I bought 3 pair of glasses on 3dstereo = 17 € glasses + 25€ transport + 10€ taxes, so yes it hurts a little 
a quick feedback on my purchase:
- The red/cyan (the ones highly recommended by 3Dstereo) -> results are amazing, I highly recommend them. Results are amazing whatever red/cyan filter. Render is far much better that the glasses I bought some months ago on aliexpress.
- The amber/blue -> very good results but the size of the glasses is very small, they look like kid glasses so not convenient for me, in particular I put them on top of my glasses.
- The magenta/green (trioviz) as somebody recommended, the glasses are the same as the one I ordered from aliexpress (the red/cyan), the results are dissapointing maybe due to the glasses so I do not recomend the magenta/green from 3Dstereo.
and do not omit to update reshade to the latest version (5.3.0) as it has some new features/options to set contrast for each eyes.