Selling candy bars?

I've been selling boxes of hand filled molded truffles this season, but am starting to think about a line of "luxury candy bar" for next fall. I have no retail location & would have to sell wholesale to local stores/supermarkets. Before going too far down this road though, I need to figure out what kind of mark up retailers might expect/demand. I know a lot of Bean to bar makers have suggested retail prices from $8-$12 for 3-5 oz bars, which strikes me as excessive. If a 3oz filled, molded bar sells for $2.50 retail, what can I sell them to the store for? Thanks for any thoughts on this.