Okay, so after a few calls and getting nowhere over the weekend, I finally cracked the code 
You can renew at the $77/yr rate, but you cannot do it through the regular call center because they will tell you till they are blue in the face, that it is only available as a one time promotion.
What you have to do is when you call about the renewal and they tell you the new regular rate $142.??, you make mention of cancelling your subscription because you can't afford it, or it's too expensive or something to that nature.
IMPORTANT - When the CSR asks you if you are thinking of cancelling, say YES. Don't tell any stories, don't hem and haw, just be straight to the point and let them know that you find the full priced rate to be too expensive. They will then transfer you to a different department.
Once you're in the second department, you will be asked again why you are cancelling. Tell them the same thing. It's almost like the CSR's are reading from a script and feeding you lines. Go with the flow
The calls are recorded, so they cannot legally offer you alternatives up front. They have to ask you questions. In order to keep you as a customer, they will then start the bargaining. They will offer you a yearly subscription at half price. This is the $77/yr rate. In my case, that's just what I wanted, so I said YES. He immediately thanked me and started changing my account to reflect that my first radio will be renewed at the same rate as it was last year.
It's just that simple.
Now, from all the research I've done, I've found that it's the US call center(s) that starts the process. When you get transferred to the second place that helps you out with rates instead of cancelling, it's mostly overseas; in my case it was Jamaica.
I've seen a 90%-95% success rate using this number 1800-347-0600 during business hours.
I called 1877-228-9058 more than ten times over the weekend and ended up in three different call centers; Phillipines, India and Trinidad. All calls were denied renewal at the promo rate and 7 out of those ended with me saying "well I guess I'd like to cancel..." and the CSR saying "okay". No bargaining, no transfer to the cancellation dept.
Bottom line, don't call the 877 number, call the 800-347-0600.
At the start of my call this afternoon, I had two radios on the account. 1 My truck (up for renewal) and 2 my wife's truck (3 yrs free). I also had a $35 credit because of a billing adjustment from last year.
I added a radio for my motorcycle (#3) and got that at the $77/yr rate. So after all was said and done, I should have had to pay $77 for #1 renewal + $77 for adding #3 - $35 credit = $119 for two radio's for one year...not so!
The guy was so helpful and admitted that he was doing this because I was so cooperative on the phone, that he credited my account $50, so that put me at $69 total for two radios with a one year subscription
Plus of course the wife's 36 month free service 
Thanks XM 