^^ Some valid points were raised on the Unitronic side.
They never actually sell their tunes through their website: all sales all done through their authorized dealers. Yes, my dealer is closed on weekends, but others aren't. And some dealers also have their own websites, where one could purchase a tune 24/7.
So as far as the Unitronic website goes, it does suck that they don't make this clear (even a link to a list of online dealers would be nice,) but it is technically possible to buy a tune at the sale price 24/7, so I guess my complaint isn't valid there.
Anyway, I'm done hounding these guys. I will likely buy their tune, but after all this screwing around, for sure not at full price. I've lived without a tune for 7 years now, so can tough it out another six months or whatever.