The SKU number is: 1603530. I picked up 2 of them today - one for a friend and one for myself. Getting 2 of them was no small feat because I had to provide a different address for the 2nd one - due to the limit of "one per household". I was ready to get about 8 of them to hook a few others in this forum up, but that would have been pretty impossible.
There is also a second SKU number involved: 1603531 - which is for the $29.99 "quick start" kit. That item appeared on my receipt along with a charge of $249.99 for the modem and finally a credit of $180 bringing the total to $100 + tax. Also, there is an entry for the $100.00 gift card towards the top of the receipt. With this deal, you are essentially purchasing the modem for $100 and getting the $100 gift card for free - that's how it's displayed on my receipt and that's how the salesperson explained it. The salesperson also indicated that they will be offering other deals - with other cable companies shortly - so keep your eyes on your local Radio Shack stores.
Now for the stumper: The serial number and MAC address both appeared on my receipts. I can understand the serial number issue, but not the reason for recording the MAC address. I plan on using this with Cox R.R. cable and hopefully there won't be any issues.
Also, the salesperson forgot to include the "quick start" kits in my bag, so I need to give them a call since the store is one hour from where I live.
The location where I found mine: The Columbia Mall Radio Shack store in Columbia, Maryland.
Good luck to y'all!!!