Just call in to sign up. I always call in with all my selections ready to go. I usually have a couple that probably shouldn't be eligible, so I have backup choices ready too.
I usually just do image searches... search for an image and then click one of the suggested terms, click another one and then x out my original search term, just leaving the suggested words. Click another suggested term and go from there. Seems to go more quickly than the web search since...
They don't expire, but if you don't sign in for 200 or so days you do lose your points. This can usually be fixed by contacting Penny @ the DMR Facebook page or a phone call to DMR support.
That's true because most of them included a digital copy too, but just being 3D doesn't unlock the DMA version. The only example that I can think of is Ghosts of the Abyss 3D, which is on DMA and has DMR code/points, but didn't include a digital copy or unlock the movie in DMA.
Yes, you get the backpack a 500 point bonus as well. But After the initial order (assuming you pick at least the first bonus) you are still left with four more purchases to make. WIth the other codes you would only have two.
http://forum.blu-ray.com/showthread.php?t=221740
All the info you need is there. There are currently three promo codes that give you your first order for $20ish, which includes the first of your 3 commitment titles. One is the standard version of that offer, another with an Olaf blanket and one...