Vs. Platoon - Not common either because it's rare or because it's a terrible game. I've never seen it for sale or anyone actually actively look for it. I have no idea what it's worth. Very little to me, but maybe a lot for a Vs. collector.
Vs. Castlevania - Great game, but almost exactly like the NES version. Though, chips can be swapped to have the daughtercard play Vs. Gradius as well. I'd say it's worth $70-80 for the complete daughtercard. Probably $90-100 complete with PCB.
Vs. Excitebike - Another awesome game with noticeable differences from the NES version. Most noticeable, the bonus level. Fairly common, but does use the much wanted PPU used for Vs. Balloon Fight (X2). I'd say it's worth $40-50 for a complete chipset. $60-70 complete with PCB.