Using crafting cost for starter items

[Shinoskay]

Is there an actual source book rule that lets you use the crafting cost for an item rather than its market price?

I know some gms ALLOW you to use craft cost, but im specifically looking for if there is a sourceable rule that allows it.

[Troacctid]

Yes, it's on page 199 of the DMG.

[Shinoskay]

Yes, it's on page 199 of the DMG.

thank you

*word and words for minimum word post limit*