My collection of Prince Valiant comics is nearing its completion, as I have purchased the last of the books available at the Fantagraphics store. I have 13 remaining books to purchase, all of which (with the exception of volume 32) fetch incredibly high prices on eBay. Interestingly enough, volumes 38-40 are the more difficult books to find, and often sell for nearly $200 or $300 a piece! The earlier books (vols. 3-8) also command high prices, averaging anywhere from $60 to $200. So I expect that filling in these last few holes will cost me a pretty penny.
One of my more expensive purchases recently was a collection of 6 DVD's, containing scans of the Valiant strips from the 1970s, 1980s, and 1990s (including the year 2000). These strips aren't available in print, so I was willing to shell out big money to obtain them. And the scans are absolutely marvelous! So far, I have read up through the end of 1987, enjoying every strip along the way. The story lines are gripping and the artwork is, as always, stunning.
I plan to eventually update my Valiant library page, including more information on each book in the series. There are so many characters, that it would be interesting to note in which books they get introduced to the story. And a general summary of each book couldn't hurt either.