Sorry for a bumping an old thread as the current promotion is currently 18 months but free financing deals are a great way to leverage your money. Financing normally appeals to those that cannot afford to lay out the initial purchase price but for those that can, its sometimes wise to take advantage of what is essentially free money. We're not talking large sums of money but free is still free. For example, lets say you have $2000 and finance a $2000 TV. I believe Best Buy's minimum payment is $10 or 1% of the balance. This would make your first payment $20 and your subsequent payments slowly decline to around $17 when the balance comes due. During those 18 months, your $2000 minus the monthly payments has been earning interest, which compounded monthly at an average 4.5% APY would yield you around $125 at the end of the term.
This is especially appealing if you don't forfeit any instant savings, which as long as they are more than the $125 would be the better deal.