I printed the webpage with the $299 price and took it to a local store. They matched the price and thanked me for giving them a chance. This might work for you too.
I was in our local Cabela's yesterday. They still had a place in the display case for the scope at the $299.99 price but were out of scopes but the guy located some at another store and I placed my order for one, which will be in in about a week. The clerk told me that the sale would be in effect thru December but he was wondering where more scopes would come from .