Didn't specify whether you wanted ARF or kit but here's a starting point . . .

ARFs you can get as low as $50 http://www3.towerhobbies.com/cgi-bin...?&I=LXLGM5&P=0
And as high as $150 http://www3.towerhobbies.com/cgi-bin...?&I=LXELP0&P=0
or even more depending on what you want.

Kits you can get as low as $33 http://www3.towerhobbies.com/cgi-bin...?&I=LXM399&P=0
And as high as $70 http://www3.towerhobbies.com/cgi-bin...?&I=LXNH96&P=0
or even more, again depending on what you are looking for

Plus you will need a hi-start for another $60 http://www3.towerhobbies.com/cgi-bin...?&I=LXE635&P=7
Or upstart for $28 http://www3.towerhobbies.com/cgi-bin...?&I=LXE637&P=7

Wingspans up to 72" need at least 300 feet of flying space while 2meter sailplanes need 800 feet of flying space