Trust the signature, not a certificate of authenticity. Anyone can make a COA. Even reputable companies issuing COAs can and have made mistakes. What you're looking for is provenance.

Go to ebay see what prices are make sure you get certificate of authenication somthig showing its real. Roger waters is 220 or five finger death punch cd 60 or less they get them signed at meet and greets at concert. Free so I offer a lot less and they take. Make offer if not auction.
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Thanks for replies, I thought $250 was a bit too hefty, even for Liam Neeson.

According to the Sanders autograph price guide Liam Neeson's signature (like an index card) is value at $32,- and a signed picture at $65,-.

Hey Wynterskye! In my personal opinion, $250 is far too much for any living celebrity. However, ultimately only you can really answer that question. If you feel comfortable paying that amount for a guaranteed authentic, then no one can really tell you otherwise :)

Anyone have any clue?

How much would be the reasonable amount to pay for a Liam Neeson autograph? Does it vary depending on the photo signed, and what if it were just an index card? For example is $250.00 more than you should pay for an autographed SW photo?

All answer very appreciated.