Optional Price Adjustments
You might have noticed that weapons and armor of the same level in the Core Rulebook can vary in price. To keep the item creation process simpler, the Scaling Gear Costs table on page 140 provides just one price per item level. However, with your GM’s permission, you can either reduce the table’s prices and upgrade costs by 10% or increase them by 10%. If you reduced the costs, reduce the number of Build Points the item receives by 1. If you increase the costs, increase the item’s number of Build Points by 1.
Source
Starfinder Enhanced pg. 143