Nothing is free in life. Even when "the first payment is on us".
When this policy is offered, it is always "included" in your price
I worked retail at a Big Box Best Buy competitor and they were having a promotion with 'Interest Free For A Year*'. So, the '*' was something that some people could not understand, apparently.
The '*' meant that you, the purchaser, had to make the 'standard payments', WITH INTEREST, and you got credit for the interest you paid at the END of the promotion.
The number of brain donors that thought that meant they didn't have to make ANY payments was embarrassing. I remember one particular argument at the 'customer services' window where someone was trying to argue that 'interest free' actually meant 'payment free', so the store was going to hear from their attorney over the repossession of their TV.
But it was in the contract, in plain UPPER CASE LETTERS, that they HAD to make payments WITH INTEREST, and would be credited the interest at the end of the promotion. If they didn't make full payments ON TIME, they didn't get the credit, but they HAD TO CONTINUE MAKING 'NORMAL PAYMENTS' for the duration of the LOAN.
Stupid Human Tricks are becoming more and more numerous. Idiocracy was a documentary of where the world is headed, and it bombed at the box office. (Irony is not dead)
And no one I knew would touch that 'promo' with a 50 foot pole.