All the tests I have taken have been federally or state funded. From the press release it seems the feds are partnering with CVS, Walgreens, Wal-Mart to do the testing in mass. So that would be the answer you seek currently.
Well, if the unvaccinated do not have to pay for the testing, that would be a reasonable compromise.
I was afraid it would cost people hundreds of dollars a week just to get tested.