| Super Shop Wizard & Shopwiz AB
Here are 2 more suggestions.
1. Making a program that lets you use the ordinary Shop Wiz like a Super Shop Wiz, so it shows all the cheapest shops in the program.
2. Some people tend to add ETS items such as Codestones, Faeries, Map Pieces, Paintbrushes, Neggs etc... into their shops for incredibly low prices. Here again there could be a program where you instantly find such a low priced item when they appear (pretty often actually) and it then automatically buys it before any other player has the chance to get it. A max NP modifier could also be installed here. This is also safer than a Main Shop AB because TNT doesn't watch the player made shops as much. | 
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