My friend bought ESS off of amazon and got replicas. (I think it was Amazon)
If you don't want to spring for high end fan goggles, then there is a another way; Valken Tactical Zulu Goggles. They are a well known paintball company that makes low-profile thermal goggles. Not all versions have thermal lenses, so read carefully. I know that Milsig carries them. Anyways, they work for some people and not for others.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē