More often than not I found that fog is temporary. I use cheap (10€) Arena google for kids as they fit me pretty well. The pair I use is almost one year old and I' fine.
There is more or less fog in the beginning but it sort itself fast enough, either I do pay that much attention as fog as (for me) a lesser effect under water as you don't see that far to begin with.
Now it is important you find google that fit you well, but don't turn into a google fixer ;)
The more attention you poor into minor details the less minor said details are.