Yeah, $20 for last gen digital, $30 for last gen physical and $40 for next gen physical. I don't know what they were smoking when they came up with that pricing, especially since there shouldn't be any difference in pricing regardless if it's next gen or current gen.
Now that I think about it, yeah the credits does seem longer than the main campaign.
I'll buy it off eBay at some point, but only for under $20.