I was just searching around ebay, and saw this great new deal. It's all 180 episodes, with a starting price of just £5, they're of very good quality, and to me looks like a total bargain! if anyone's interested then here's the item number and title: 6312955334 Seinfeld DVD's Series 1-9 All 180 Episodes !!!
p.s. the seller only sells to the uk and i assume only appears on Ebay.co.uk and not the american version