There are a number of different approaches that can be used which is best depends on the design of your database and layout.
GetNthRecord is a function that can pull data from the previous record.
GetNthRecord ( Table::NewPrice ; Get ( RecordNumber ) - 1 ) will pull data from the previous record listed in the found set or a portal. Whether that record always represents the record with the most recently inputted data depends on the design of your layout.
A self join relationship that sorts by date so the most recently dated record is first, can also be used to access a previous record. How you structure that relationship depends again on the structure of your database. It could also sort by a serial number field to put the most recent record first.