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Should I finance a new home theater at 0% even though I have the cash for it?
Be very careful with this.  When we tried this with furniture, they charged an "administrative" fee to setup the account.  I believe it was about $75.  So if you defer interest for one year on a $1000 purchase and pay a $75 administrative fee, it's 7.5% interest. Also, they don't always send you a bill when it's due, they just let you go over the date when you could have paid it without paying interest, and then you owe interest from the date of purchase.  These plans are slimy.  Be careful.