Systems and methods for facilitating purchase offer selection across multiple online sales platforms are disclosed. Exemplary implementations may: obtain first information defining a first sales listing of a particular virtual item on a first online sales platform; obtain second information defining a second sales listing of the particular virtual item on a second online sales platform; receive at least two indications of offers to purchase the particular virtual item; obtain information that represents at least one sales characteristic by which the offers to purchase the particular virtual item are to be ranked according to desirability; determine and compare a first metric value for the first offer and a second metric value for the second offer; and determine an accepted offer that is accepted based on the comparison.