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I have two main directions I'm considering:
If you can't sell the E-Book at the price you mentioned I wouldn't try making it cheaper. You could try charging more and enhancing the site's design to match the increased price, if indeed there's room to move there.
Affiliate links to a merchant is probably the way to go. By placing the content of the E-Book online you'll be creating an asset for future linking, and that can be lucrative in many ways.