The Buddy code is tricky!
-First, you have to be logged in
on the Hobby King web site.
-Then, you can click on a buddy code (a good buddy code is a link, so it should open a new window or a tab if possible). When you open that, you will see that the price is marked down (with a * beside the price). You can then add ONE to your cart. (If you try to add more, sometime it doesn't work).
-Then, once it's in your cart, you can change the QTY up to a maximum of 3, and update your cart.
If a buddy doesn't work, it's because it's over (they are good for only a few days) or has been used. The fact that they are backorded shouldn't affect the buddy code.
Here's two sites that are pretty good if you want to look for buddy codes in the future:
Too bad you could not use those codes. Though, even at $5 each, they are still a good deal in my book. But at half that price, then it's a steal. Even if they last only 50 cycles, I figure I'll simply use the connector and wiring to make my own Hyperions pack after. The wires are a bit small, but I kind of love the fact that they are easy to squeeze into my airplanes (I normally use very heavy guage wires when I make my packs to reduce wiring resistance). Basically, it would cost almost $2.50 to have this connector crimped with 3 wires alone, so you get X flights for free!
I fly less often in winter, so it will take a long time before I rake lots of flight on them, but at least for now, I can say they do pretty good in the cold we have already.