After getting to Urbeth and unlocking the extra item shop by obtaining the magic key, purchase any amount of Break Tomes at 2500g each. After doing so, head over to the weapon shop and use the counter. Go back and forth between the records/instructions screen and the storage screen until you have only single slots to sell your items (somtimes it takes a few tries). Fill the first three slots with your break tomes and continue dispite empty slots. Mark all three as 5000G items and I suggest putting a "Hot Deal!" on one. Sell these three items and repeat as neceassry for a 7500g profit everytime.(P.S.- I'm sorry if anyone else posted something like this. I just figured this out on my own and am not trying to steal anyone else's ideas.)