Here's what I've got so far from all the hints:
1. Search for the item name: Ex. I used Training Mining Tool
2. Browse the address for the item.
3. Search for the byte value 0A. Usually this value is 3 values away from a single byte value. In my example, the 0A is 3 values away from 06.
4. From this value, add 0C hex to the address. Add this new value. Change the value to 1. Now the item should be "tradable". (correction, don't add 10, add 0C)
I've done the trade with a training mining tool but i haven't tried it with anything else.