Only Dragonborn? 0.o
There was a time when only Dragonborn was out?
On the PS3? Yes...it was terrible.
Dragonborn finally came out Feb 12, 2013
Hearthfire came out after 5 months on Feb 19, 2013
And Dawnguard....came out after 8 months on Feb 26, 2013
I'm surprised you didn't know. All three came out with a 50% discount on their first week.
That means that if you got them all when they came out, you would have gotten them for $22.49.