Where can i buy SpongeBob SquarePants seasons cheapest???!

I want to buy SpongeBob SquarePants seasons, where can i get them cheapest!?!? would downloading them and putting them on2 a disc be cheaper than buying it!? if not where can i buy it cheapest!? (what i mean by downloading it is, yknow how u hav 2 pay 2 use the internet, and downloading and watching vids on the internet is more money!.!. yea!.!. thats what i mean!.!.) Thanks!.!.Www@Enter-QA@Com

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