Seasons 7 & 8 haven't been released. I'll tell you what I'll do--'cause you look like a nice guy--go to amazon.com periodically and type "Seinfeld" in its product search-box. When 7 & 8 are available, amazon will know and then you will too.
Anybody around her who recommends you buy something on the market today can't be trusted and should be summarily executed, like you would a homeless person.