In other words, at the price of one season DVD set, you can actually get handfuls of downloads - not only Nip/Tuck, but plenty of other popular serials, which may or may not be aired currently. In fact, there are legitimate and professionally run websites that offer TV series for unlimited downloads.
Many will also try to make you click on their ads, even if you do not want to. More than 90% of all sites offering Nip/Tuck Episodes, especially the latest ones, are harmful for your computer, installing malware to spy on your Internet surfing habits and even get your private info. So, do not fool yourself thinking that people just share great free stuff out of generosity. But the truth is that there is a lot of copyright infringement going on and these sites choose to ignore it, because they are interested in attracting visitors and getting money from advertisements. Quite often, you can see the disclaimer, saying that the site does not host any of the video materials therefore, it does not violate copyright laws. They might excuse themselves by claiming they bear no responsibility of what links their users share.
However, as you can figure it out, most of the sites, offering you to download Nip/Tuck Episodes for free, are simply illegal.