X-men titles switched between issues #111 and #114 from just "X-men" to "Uncanny X-men" so it may be worth checking first to see which category you would fall into.
For the first issue of X-men, published in 1963, many people are asking thousands for it in good condition. For titles published over the next ten years, depending on the title, you can fetch anywhere from $10 - $150 depending on condition and rarity.
Once the titles switched to Uncanny at issue #114, prices drop dramatically. X-men titles were published more frequently and in higher quantities. Comics from #114 - roughly #277 fetch about $4.00 each, unless it's a special title that is highly sought after, like certain sagas and special character introductions. After #277 - present, the titles hardly receive $0.99 a piece. They are frequently put into groups and sold at prices that individually make up for about $0.45 a piece.
I used personal selling experience, ebay.com, and Amazon.com as well as talking with two acquaintances who own comic shops as my references.
1991 G.I. Joe Cards
$80-$100
About £90 GBP
10.00
in mint condition it's worth aprox. 2,300$!
With original Mint packaging retail value is about $8.00, issue price was $7.00
$1579.00
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cable 1st issue is worth 200$
It would depend on the year of issue and the denomination.
I would say that that one would be anywhere from $250 to $1000 dollars.
It's still worth 25 cents.
Marvel
1991 G.I. Joe Cards
$100 in 2009 is equal to $64 in 1991.
Less than 50 cents.
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