Where to buy the DVD?

Aside from Amazon.com? I boycotted them after a series of incidents where I lost both products and money. I was watching this online before the last episodes got screwed up and I liked it, so I figured I'd just buy the lot, but I can't find it to purchase or rent anywhere. :/

If you don’t stop burning my scarf you’re going to have to kill me!-Tom Baker, Doctor Who