Here in the Southeast the grocery chain Publix is pretty much the BOGO chain, as in you buy stuff that is BOGO and take care otherwise. Their prices are standard fare for a chain grocery and the standard price of the item falls in line with other chains. Now for the most part any serious saver would BOGO and then hit up Wal Mart or Aldi to finish out their savings.
One interesting note is that in general you don't have to buy two items as part of a BOGO, you can buy one at half price. Now this is not true as some manufacturers, namely Coca Cola, require the purchase to be made as described. Meaning if its buy two get one you must take all three. They even get silly with Publix in that there will be buy two get two with Coke products that, you guessed it, you have to have four of the product to get it at the price of two.
One interesting note is that in general you don't have to buy two items as part of a BOGO, you can buy one at half price. Now this is not true as some manufacturers, namely Coca Cola, require the purchase to be made as described. Meaning if its buy two get one you must take all three. They even get silly with Publix in that there will be buy two get two with Coke products that, you guessed it, you have to have four of the product to get it at the price of two.