This looks a good deal to me - and it's all the series (not just to 5). Each series is going for about £9.99 at the mo, with Series 6 going on sale for about £15 soon. Oh, and free delivery.
Only one catch - you have to wait until the 9th June. (better still, if the price goes down - you get the saving. If the price goes up, you get the cheap price. If you find it cheaper elsewhere - cancel the order before June).
Also nice with NUS discount - £5.80 off.
"Life continues to befuddle hapless millionaire (and SEINFELD producer) Larry David in the hit U.S. comedy CURB YOUR ENTHUSIASM. As usual, Larry is joined by his faithful, beleaguered wife, Cheryl (Cheryl Hines), and his manager, Jeff (Jeff Garlin), while regular guests such as Ted Danson, Wanda Sykes, and Richard Lewis are on hand to add to the mayhem. This release contains every episode from Series 1 to 6."