Zombie Hunter/Level 5

First quarter
A shop at the beginning sells Medicine x2, Medicine x4, and Thunder Lv5.

Second quarter
Above Battle #13 is a hidden shop which sells Medicine x1, Medicine x3, and Armor Lv1.

Third quarter
Above Battle #20 is a hidden shop which sells Medicine x2, Medicine x6, and Mace Lv6.

Fourth quarter
At the left of tiny platform of Battle #25, or above #27, is a hidden shop which sells Medicine x2, Medicine x4, and Medicine x4 (yes, same item appears twice).

First quarter
Shop item: Medicine 1, Medicine 3, Sword 7.

Second quarter
Shop item: Medicine 1, Medicine 3, Sword 2.
 * Behind the jail.

Third quarter
Shop item: Medicine 2, Medicine 6, Magic Book 3.
 * Found at the cross near #20.

Fourth quarter
Shop item: Medicine 2, Medicine 4, Dagger 7.
 * At the first skull beneath spiked ceiling.