Toys"R"Us offers the Hasbro Memory Game: Despicable Me Edition for $4.79. (Jet offers it to its members for the same price with free shipping; Amazon has it for the same price, but only with orders of $25 or more.) Opt for in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find by $1, outside the offer below. It includes 48 picture cards, all featuring various Minions.
A close price: Hasbro via eBay offers it for $5.09 with free shipping.