I have a little insight into that whole thing. I manage a bar, and speak with reps and sales people every day. It seems Guinness' 11oz bottles didnt go over to well. According to our rep Guinness will be getting rid of the bottles in some areas. It seems even with the masive advertising campaign they did, the 16oz cans still sell better.
The distributer here has sales on saturday mornings to the public of partial cases, mix match, make your own case. Any case is 10 bucks. I'm sure you can find the same deal in your area.