Why not? All the packaged foods are the same as in the regular full service markets. A Perdue chicken is the same chicken as in the more expensive ones - just $1.00/lb cheaper. I just checked the 'Bottom Dollar' flyer - they have Hellman's mayonnaise for $3.77 - the other guys are $4.99 - I know where I would shop.
I doubt that highly. Probably the stuff at the discount store has been in storage longer and is closer to code, or is even from a different batch and recipe, possibly even less product. We know from stuff that’s come out about WalMart that those are all favorite ways of meeting WalMart’s price demands, including in their grocery section. You don’t make 25% of the price disappear by magic, that means 25% of the cost had to go away too.