AutoQuotes prices are always up to date, if you open an old quote you can tell instantly if a manufacturers List Price has changed or updated since the quote was first created, it does this by showing stale data in RED , you will also notice an ! next to the value in the List, Net or Discount Cell.
To update a single List Price - hover your mouse over the " ! " and click it.
To update multiple list prices - select all the required lines using the shift or control key, then right click and select "update with catalogue" and select "list prices" as shown below.