0|5
Batteries
Cleaning Products
Computers
Contact Lenses
DVDs
Flowers
Frozen Foods
Male Clothing
Musical Instruments
Pots of Paint
Sunglasses
Tools
Vegetables

1|6
Appliances
Balloons
Chocolate
Costumes
Eggs
Female Shoes
Minipet Food
Minipets
Pearls
School Supplies
Seeds
Sushi
Weapons

2|7
Armour
Bakery
Candy
Charity
Giant Vegetables
Gourmet Meat
Halloween Treats
Illegal Concoctions
Male Shoes
Pizza
Soft Drinks
Wallpaper
Wigs

3|8
Books
Canned Food
Car Parts
Fast Food
Fruits
Furniture
Giant Flowers
Hair Dye
Ice Cream
Potions
Stars
Voodoo Dolls

4|9
CDs
Charms
Cooking Ingredients
Female Clothing
Flooring
Giant Fruits
Lipsticks
Magic
Medicine
Stamps
Toys
Trading Cards

If the shop number ends in 0 or 5 the shop restocks at the 4 and 9 minutes.

If the shop number ends in 1 or 6 the shop restocks at the 0 and 5 minutes.

If the shop number ends in 2 or 7 the shop restocks at the 1 and 6 minutes.

If the shop number ends in 3 or 8 the shop restocks at the 2 and 7 minutes.

And if the shop number ends in 4 or 9 the shop restocks at the 3 and 8 minutes.

http://www.marapetsuniversity.com/restock.php

People who underprice:
1) hotpurslover