You can find a nice glider for around $10K. At least you could a year or so ago when the dollar was high against the Euro. I bought a very nice Libelle out of Germany for less than $10,000 U.S. Had it shipped over for less than $2000. My definition of nice is: refinished, no damage, ready to fly with a sound trailer. Maybe I'm not an 'experienced' glider buyer, but this is my 3rd glider and 4th aircraft overall. Having said all that, I now wish I had taken advantage of the favorabable dollar: euro ratio and had bought more glider.
Ka-6's and Ka-8's can be had out of europe for about what it costs to ship them over. However, since the original glider in question was a Libelle, I'll stay with cheap glass for the rest of the discussion.
201 Libelles ( I prefer the 'real' H301 Libelle), ASW-15's and particularly the Standard Cirrus are plentiful and cheap in Europe. You will find that each of those can present a challenge to inexperienced pilots, but they are not too bad. That's a topic that's been discussed here before.
You can have a look at a lot of gliders for sale at:
http://www.segelflug.de/cgi-bin/classifieds/
classifieds.cgi Look in the 'Clubklasse' for gliders in the $10K range.