Welcome to Autograph Live! Members can help you find them, and let you know their opinions on authenticity when you find ones you're considering.
Genuine John Lennon autographs start in around the $1,300-$1,500 range for ones that are in decent condition, and can go much higher. Is that in your budget?
Great! An autograph on something that isn't special, like a regular piece of paper, is in the low range. Signed checks are about $5,000 or more. Other pieces start in the mid $2,000s and go up.
Let's see what members can point you to, or go to eBay and post links here if you'd like. Look at these great dealers, too. Most will probably have at least one Lennon in stock.