Are they attempting payment on these?
Could be rogue user (or bot) attempts to verify stolen / fraudulent CCs before making larger payment amounts or enabling them to sell-on the CC information as “Verified working” which commands a higher price on the black market.
Using the lowest priced item is a way to avoid red flags on stolen CC’s as banks often immediately stop one off unusually high payment amounts AND/OR a way to verify stolen CC information where small purchase amount is likely to fly under the real owners radar on bank statements thus preventing real owner cancelling card/reporting to their bank.