From CEX. £10 for three seasons.
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A lot of people forget that these first seasons at least, tied in to the MCU movies. Phil Caulson's return, Lady Sif, Hydra and events running along side Captain America Winter Soldier. I lost track of the series after these seasons.
The episodes with Victoria Hand and Hydra I thought were great and there are the Bobbi Morse (Mockingbird) episodes.
So, even if I don't get anymore after these seasons, I have the episodes I really want. Nice.