Apple/iTunes currently has many complete TV series releases on sale.
These can be viewed via the Apple TV app on most streaming devices:

• The Affair $29.99 (https://apple.co/32hfh9z)
• Berlin Station $14.99 (https://apple.co/32iEqkf)
• Black Sails $14.99 (https://apple.co/3DFtv1W)
• The Borgias $19.99 (https://apple.co/3cw3wxI)
• Broad City $29.99 (https://apple.co/30LC1y3)
• Brotherhood $19.99 (https://apple.co/3nxg2na)
• Californication $29.99 (https://apple.co/3CrvVQc)
• Catch-22 $4.99 (https://apple.co/3DypFYn)
• CSI: Crime Scene Investigation $49.99 (https://apple.co/3oMnHNC)
• CSI: Miami $29.99 (https://apple.co/3CsStzT)
• CSI: NY $29.99 (https://apple.co/3qPssbR)
• Dexter $29.99 (original series) (https://apple.co/3x0QqC0)
• Episodes $19.99 (https://apple.co/3CxeYnt)
• Freaks and Geeks $4.99 (https://apple.co/3Fn8wkO)
• The Good Place $24.99 (https://apple.co/3HFhyvh)
• Hawaii Five-0 $49.99 (https://apple.co/3nviLNF)
• House of Lies $19.99 (https://apple.co/3x0Hw7L)
• Humans $14.99 (https://apple.co/3Fv3jaK)
• Kroll Show $19.99 (https://apple.co/3cwsBZz)
• The L Word $19.99 (https://apple.co/3HCNuAv)
• Looking For Alaska $4.99 (https://apple.co/3ctG5Fn)
• Mad Men $19.99 (https://apple.co/3qSSqLJ)
• Mama’s Family $29.99 (https://apple.co/3Dy8OVz)
• Mr. Robot $24.99 (https://apple.co/2Z2pMfA)
• Nathan For You $14.99 (https://apple.co/3ctspdG)
• Orphan Black $24.99 (https://apple.co/3CvLWEQ)
• Perpetual Grace LTD $4.99 (https://apple.co/3oIUHGB)
• Sex and the City $49.99 (https://apple.co/3DzDVQy)
• Sherlock $24.99 (https://apple.co/3HzpMVP)
• The Stand (2020) $12.99 (https://apple.co/30OxB9s)
• Strike Back $39.99 (https://apple.co/3r0pPE6)
• Teen Wolf $29.99 (https://apple.co/3cv4L0k)
• The Tudors $19.99 (https://apple.co/3nyN6LA)
• United States of Tara $19.99 (https://apple.co/3CzmJJF)
• Weeds $19.99 (https://apple.co/3CA86FT)
• Younger $24.99 (https://apple.co/3nxWbUN)