Fix: order item-list SINGLE_E31270_V6 --prices dal13

[allmightyspiff]

Related to #1319
order item-list SINGLE_E31270_V6 --prices dal13 returns Package dal13 does not exist

--prices should take 0-1 arguments, which I think can be done will a callback function https://click.palletsprojects.com/en/7.x/advanced/#parameter-modifications