A collection of nodes can be sorted on the attribute level. This means that it is possible to sort a bunch of nodes (of the same type) by one of the attributes; for example sort nodes that contain information about people on the attribute that contains the nickname. The following datatypes support sorting on attribute level:
-ezboolean
-ezdate
-ezdatetime
-ezemail
-ezinteger
-ezselection (will not work when used as multiple selector)
-ezstring -eztime
..don't see the price datatype there.. so, I guess it is not possible at the moment. However, shouldn't be to hard to hack that in.
Balazs
PS: The docpage is: http://ez.no/ez_publish/documentation/reference/data_fetching/content/list