Where can I buy a DVD with one season of Dancing with the Stars?

I am looking for a DVD of the TV show Dancing with the Stars to give as a birthday gift, and I need to get it delivered by Friday. When I looked on Amazon, they had lots of excercise DVDs with the Dancing with the Stars brand, but they weren’t the actual TV show. When I googled the TV show DVD, I could only find boxed sets of many seasons for over $50. I’m looking to buy just one DVD, of any season, hopefully for less than $20. And if there are any Dancing with the Stars fans out there, let me know which is the best season, since I never watch the show and don’t know if one particular season is better than the others. Thanks!