in the quote screen with Part Summary, the items listed should show the date the last time the item was purchased or ran on a job. Old dates could be flagged that they need to be reviewed for up to date cost. Common components used all the time would have recent dates, a user would skip over those. But dates over 1 to 2 years old would need to be re-costed due to lack of activity. Those items could be highlighted in yellow as a caution. In system preferences a user could set the time frame for date of last use or purchase: 12 months, 24, etc..