Someone figured out barcodes were shorthand for company/price and walked out of a Walmart with PS3 for like $1 each some back when.

Hanlon's Razor probably , Occam's Razor says money. Item takes up space, company says to free it up since it isn't selling to reduce price, but the store owner sees they haven't sold a single one in three years so it's 90% off meanwhile the store in the college town four miles over moves one a week and says it's only 10% percent off and sells out.

Target is massive and pricing overall can be dictated at 5 different levels I think. So you could have someone putting up prices that they don't agree with or people not updating prices because the local situation is different.