They need to change the wording of the listing, since they were selling the "Set" before they made the newest buildings. It's supposed to consist of one each of the following: SFB-001 Communication Building, SFB-002 Factory, SFB-003 Laboratories, SFB-004 Warehouse, and SFB-005 Small Factory. Maybe they need to make "Building Set 2", which would include just the 4 newest buildings, and/or "Building Set 3", which would include all 9 buildings? ???
The current "Building Set" is $59.95, though individually they add up to $68.75, so you save almost $10.00 by buying the set. Adding the 4 new buildings to the current "Set" brings it up to $108.80, so maybe "Set 3" would sell for $99.95? They could maybe sell "Set 2" for $39.95 (currently $48.80 individually) ?