Goggles - fogging solution?

Just had my first airsoft experience last night at panther and had a great time except for the terrible fogging i was having with my goggle. Was wondering what goggle people would recommend. The ones i have appear to have very good ventilation. The vents are covered with foam so i took it off and also tried some antifog spray i bought from a glasses store. Gonna try it out this weekend at ambush but i have my doubts about it working. I have seen some fan add ons online but cant find anywhere that sell them. Thanks