I have been have good luck finding glass bottle sodas in central Illinois. Sam's club carries IBC Root Beer by the case at about $0.40 per bottle. They also have the Mexican Coke by the case. I believe it is around $0.75 per bottle. K-Mart is good for IBC Black Cherry, Cream Soda, and Grape, Strawberry and Orange Crush for about $0.55 per bottle buying 6 packs. Wal-Mart also carries the Orange, Strawberry and Orange Crush for a similar price. Several other varieties are available, but they are around $1 per bottle. Hopefully, more will drop their price closer to the $0.50 per bottle range.
$0.40 bottle = $9.60/24 or $2.40/6 - That's not a bad price at all for IBC these days.
Glass bottles carry considerably more risks for the store and bottler, which I can't help but think is being factored into their price. They can be broken easily before they're paid for, and people can easily get hurt on the broken glass. I don't know if they will ever get much cheaper because of that. That may be one reason glass bottles are more common in other countries, fewer lawsuits.
One thing I haven't heard much mention of is glass bottle Pepsi, are those still around?