Head over to Coupons.com and print the $1/10 Yoplait coupon (expiration varies). Even better, Walamrt carries these for only $0.50 every day.
WalMart
Buy (10) Yoplait Yogurt Cup, 8 oz $0.50, regular price
Use $1.00/10 – Yoplait Yogurt Cups
Pay $4.00
Submit $0.75/4 – Yoplait Yogurt Cups, 4 or 6 oz, via rebate app (ibotta.com)
Final Price: $0.33 each, when you buy 10