How much does an eye exam cost at walmart without insurance?

I need a new pair of glasses and contact lenses. But i dont know how much it will cost? Will i need both glasses and contact lenses exams? Whats the differences with the 2 exams? Thank you so much! Your help is appreciated!

$100

Exam at Costco = $50 even for non members I think

Glasses at zennioptical = start at $7 per pair plus shipping
Www.zennioptical.com