I reference 'list price' in my Pricing Rule but what if no list price is available on Amazon for an item?

Sellery has a fall back order that is used when a value is indicated in your Pricing Rule but for whatever reason, doesn't exist or isn't sent by Amazon through their API. 

If there is no list price available, Sellery will look next to the lowest new price, followed then by the lowest used, and finally, your item's Minimum Price.