The Rick Steves Store is offering the complete set of his DVDs from 2000 to 2016 for only $10. It does not contain any of his newer DVDs but it does contain 16 DVDs.
That's a great deal. But I never watch actual DVDs anymore. The first thing I would do if I got the set was to rip everything to mp4 files and then probably donate the whole set to my library...which probably already has one.
That's actually a really good idea.
You can watch most if not all the past episodes for free on YouTube; with bonus that they are in HD which the DVD’s lack. Also available on Amazon Prime Streaming.
Or follow the links from this website
You can also watch his shows on Hulu.