You won't be able to buy Simon's goggles anywhere. You'd have to make them by scratch. My suggestion is to make the goggles out of craft foam and clear yellow plastic sheets.
[~Future Cosplay Plans~]
Unbeatable Squirrel Girl (MARVEL) - 35%
Star Butterfly (Star vs. The Forces of Evil)
Mabel Pines [Reverse Falls AU] (Gravity Falls)
Stanford Pines [Portal outfit] (Gravity Falls)
Pearl / Lapis Lazuli / Sardonyx (Steven Universe)
Montreal Comic Con 2017 l Otakuthon 2017