Any information on 2003 Disney Haunted Mansion would be appreciated
I have a set of these cards not from the sheet but as cards
COMC has them as card at a very high price and are cards from the sheet.
Would these be a realistic price for the cards or they just trying.
I do not think that COMC actually put their prices but the seller dictates the price.

vague memory of there being 3 single cards and 2 diffrent uncut strips.

Yes there is apparently a 3 card sheet sort of a tryptich format I think

PCE2008 lists 3 different 3-card panels for Haunted Mansion (Artbox Entertainment, 2003): one with gold foil; one with silver foil and one with no foil. The singles are priced at $2 each and the panels are at $5 each. I haven't followed the sales history of this set and I don't see what you're seeing. It's possible the values have jumped in the past 15 years but check for actual sales to see if the seller knows the market or just wishfully thinking.