Solutions to sweat & fogging (quest 2)

Are there any worthwhile, affordable solutions to prevent my lens from fogging when playing the game?

I had tried this small rechargable fan that snaps on the top and acts as a vent, but its face mask isn't as nice as other I have (narrow). And the vent couldn't be removed/wiped down without breaking it off of the base. I was suprised becausegit was effective, but had fundamental flaws that I couldn't seem to accept.

Has anyone figured it out? And (pretty please) not spend an arm & a leg.