I think it is not open every day as they have stores in 3 towns. Best to call first. Available 24 hours.
Melaque--58-B Benito Juarez.
Phone: 01-315 355 5740 or 315 104 3358
Benito Juarez is the one way street going along the beach side of the jardin in Melaque. From the jardin, go 3 or 4 blocks south(toward Obregon, Barra). The obvious signage and store are on the left.