I've looked and yes FALCON and CAPTAIN MARVEL where a NORTH AMERICA ONLY release in a 2-pack bag. I'm pleasantly surprised however to see Falcon on the CEX site for a fiver. Not their most expensive disc ( TRON sky and terrain are pricier ). And they have CAPTAIN MARVEL too, she's £4.
JUST FOR INFO: CEX's most expensive disc is the PETER PAN Skydome at £10. Then Merlin's summon at £7. Zurg's wrath and the TRON discs at £6 each.
I was happy to pick up the orange 'exclusive' Tron's user control for 25p the other day. and a few others for 10, 25 and 50p each too. I don't have anywhere locally apart from CEX and occasionally at CASH CONVERTERS for discs, so CEX online is my best resource. Ebay sellers seem to want at least £1.50 for each disc, and it's commonly much more.