This is the "Target exclusive" edition with 4 Discs (or the regular 3 disc 3D release if you prefer; Target has both). This is the same price that WalMart had last week but the 4-disc Target edition is available.
It includes 4 formats: 3-D BD, regular BD, DVD, digital.
If you go in-store to buy it, be conscious of what version you pick. Target carries two versions of the 3-D BluRay. Both are $19.99 but the Target exclusive version has 4 discs while the standard 3-D release includes only 3 discs; I don't know what's on the extra disc). The exclusive version has a red-orange-yellow-blue cover (watch out for the Target non-3-D version with the same cover) while the standard 3-D version has a lenticular cover with a burning Enterprise (similar but not the same as the pic here).
Oddly, the non-3-D BluRay currently costs $5 more than this version.
I just noticed that this shows as "not sold online" but it's too good a deal to not post. Tattle if it's inappropriate.