Right you are. Must be a typo.
List on the TSP-2AA is $40
"TSP" = "Tail Switch Pack"
"P" = Pack
All packs with a tail switch have a "TSP" prefix. All packs without a tail switch only have a "P" prefix.
Examples:
TSP-2AA
TSP-123
TSP-2x123
P-123
Peter Gransee