Amazon offers Prime members The Rescuers / The Rescuers Down Under: 35th Anniversary 3-Disc Edition on Blu-Ray / DVD for $12.05 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $4.98.) Excluding the below mention, that's the lowest total price we could find by $3, although we saw it for $2 less last April.
Need it today? Walmart has it for $12.25 via in-store pickup.