Walmart offers the Infantino Flip Front-2-Back Carrier
in Black, model no. 200-103, for $18.88
has it for the same price exclusively for Prime members.) Opt for in-store pickup
to avoid the $4.97 shipping charge. Excluding the below mention and other Amazon vendors, that's the lowest price we could find by $6. It supports infants from 8 to 32 lbs. and features three carrying positions, a BreatheMesh carrier body, padded adjustable straps, adjustable lumbar support, and Wonder cover bib.
A close price: Target
has it for $18.99 via in-store pickup.