I wonder if Borderlands GOTY is the version with the dlc on a separate disc, or the tokens (downloadable dlc codes). The picture shows that it is the more recent version with the dlc on disc, but from reading the customer reviews, newegg also sold the older version with just the tokens.
I was interesting also for a copy for me and my cousin, looked into it and people on amazon commented that moving the dlc from one pc to another is a hassle if from the code voucher. Also sniped a recent review that the Amazon Download for the Boderlands GOTY is $7.49 and you can register the serial on steam and have the DLC also. Bought and added, can see the dlc in the list. Hope it helps.