XG1v4 DVR Boxes Out of Stock at Local Xfinity Store

I have been trying to get an XG1v4 DVR box from my local Xfinity retail store. They have been out of stock the last three times I have visited, so I either end up with an older wired Version 3, which is non-4K, or a wireless version, XI6-T, which isn't as stable. The rep told me that they could order an XG1v4, but I would be charged $15.00 to have it shipped to me - the same price that I would be charged if I ordered it online. I want to avoid the $15.00 charge. Should I just keep going back to the retail store, hoping they have one in stock so I don't have to pay the shipping charge or is there another way I can get the DVR without having to pay the shipping charge? Seems to me that if they don't have the unit in stock, they should waive the charge as a customer courtesy for the inconvenience.