How many Walmart's worth? Big numbers are meh, just tell us what the state income tax delta is (federal taxes still getting paid). It's not a total loss, people will still move and work in the locales these jobs moved from, as well as pay property taxes (as real estate prices and rents aren't going down in CA and NY from all available data).

If California and NY want those dollars back, extract it through the federal government and the top 40% who pay federal income tax and can't avoid it (congresscritter hustle). You know, like red states do.