I'm in the same boat as you are glasses wise. After a couple of seasons of screwing around with pball goggle/fan setups, I just got myself a decent sets of tac goggles. I purchased the ESS profile NVG goggles, along with the rx adapter. Had my local hakim optical whip me up a set of lenses, and I havnt looked back since.
Just how good are the profile nvg goggles? Well, I have been to 5-6 events with them so far and zero fogging at all. As well I've worn them biking to work - if they can stand up to the amount of body heat I put off biking 50km on a hot humid ottawa day, then that's pretty much all the torture testing I think they need.
Total cost for the above setup will be about $260ish - expensive but they don't look like ass.
However if you insist on this fan venture, try the source, they usually carry them, or ebay.
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