IIRC the CIII Vader sold from $50 to $75 right after CIII.
Nowadays they run about $15 - right about what they cost at the event.
Don't overpay for these now. Be patient. They'll either show up in stores, or they'll get much much cheaper on eBay.
I couldn't agree more. Wait.
On top of that, these are three pretty much brand new sculpts, aren't they? Hasn't Hasbro repeatedly said they won't do a new sculpt for a low production run figure? If so, the likelihood is these will be released, en masse, down the road. Yes, a different cardback invariably, but that's an issue for carded completeists and they have to deal with their OCD, I don't.
They are $15 figures at retail, if not $18-20.
So a pair should run you $40 (remember the $3 custom star case) if you're getting them at cost, from someone helping you (not factoring in their cost of admission and time to get these).
They'll be released down the road in larger numbers on new cardbacks.
Prices will drop even if they're not released.
Geez, I'm willing to bet if you wait a year, you can get them for less than what they're charging at C4. Anyone wanna buy a C3 Vader mint with Star Case for $18? I doubt it.