How much is my Joe Namath 1 in 4000 Topps Collectible worth?

I have a framed Joe Namath Topps Collectible with cards from all his teams throughout the years. It’s certified as 1 in 4000 and I’m just wondering how much it’s worth, or if you could tell me where to go to find out how much it’s worth?
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LOL! You have to find a buyer first. If you find one, take his offer. LMAO!
Check out beckett.com. They specialize in sports-card prices.
That said, the answer to these questions is always the same: It’s worth as much as someone is willing to pay for it. That could be $5 to a casual fan, or $500 to a Joe Namath fanatic.