Yeah, yeah. I know. BUT, that's the one I'd go with. Doesn't look like there's much available for it, so unless you want a 14ft long cable, I think that's the best option right now. Must be a pretty new unit to not have a bunch of options on Amazon. I'd be very surprised that ASUS doesn't have replacements. In fact, I think legally, they HAVE to have them. Spare parts laws and all that.
I'm sure it wouldn't be cheap though. I agree with you that I'd go back to best buy and tell them it didn't have one with it. If it's less than 90 days old, most state laws require the vendor to warrant the item or make it right. Not all states do though. Colorado for example only requires the vendor to cover items for 30 days.