RightStuf is having a pretty decent sale, you can get Dragon Ball Z DVD box sets for $16 each. $150 for the entire series.
Or Dragon Ball Z Kai (which is a remastered recut Dragon Ball Z that ends at the end of the Cell Games Saga) on Blu-ray for $25 each.
http://www.rightstuf.com/1-800-338-6...em/94448/4/0/0
And I didn't know but they're doing a Blu-ray uncut of the whole series, I might wait for that.