Ragweed Forge is a good place to look for anything from the most basic moras to quite nice, high quality puukkos. Have a look at the various brands. Also look at some Kellam puukkos (
http://www.kellamknives.com/index.php?main_page=index&zenid=54a28cfba41cf23c894f1da8d235724f), which are said to be very nice, and look at some Woodsknife puukkos at Cloudberry Market (
http://www.cloudberrymarket.com/servlet/the-PUUKKO-KNIVES-FINLAND-cln-Woodsknife/Categories). I have one, and it is high quality. The handle is extremely comfortable, the blade is good, and the sheath is quite nice.
Also, Ragweed Forge has a decent selection of just puukko blades (
http://ragweedforge.com/BladeCatalog.html), I'd suggest picking one up, putting your own handle on, and making your own sheath if you're looking for a bit more of an involved experience. It's not terribly hard to do, and it's cheap as well. If you decide to try it out, there's two pages of links to various tutorials here:
http://www.knifeforums.com/forums/showtopic.php?tid/812415/tp/2/ and a quite good guide for putting on your own handle here:
http://ragweedforge.com/mount.html (make sure to look at the links at the bottom of the page) and for making your own sheath here:
http://ragweedforge.com/sheath.html.
There's also a dedicated Scandinavian forum which has tons of info on puukkos (make sure to check out the gallery):
http://www.knifeforums.com/forums/showforum.php?fid/124/
Here's a picture of a Woodsknife puukko I own:
I'm sending it off to Tom Krein to get it reground to 1/16" thick, and I'm having a full flat grind put on it (BLASPHEMY!). Then I'm having it sent down to JRE Leather to get a pocket sheath made for it. I also took some steel wool the to handle to smooth it out. Since the handle is so nicely contoured, a smoother surface still allows a very solid grip, even when slightly wet, and I think it feels much nicer this way.