I am trying to get strike-out pricing set up on our website. I have set the default price, and added it to the Search index, but it isn't working. Has anyone run into these issues?

Presumably you've also rebuilt the search index? Also, what do you mean "it isn't working"? What specifically? Is the data being included in the item search API responses? Is it being sent to the template's context object? Are you definitely using a compatible version of SC/A?