Digital Sampling

Looking for a digital sampler, something about the size of a single effects pedal if possible. I have seen them used but know nothing about them. What I would like to do is play about 30sec worth on the guitar then have that loop around and play over it. Any idea of the prices of these things and what's out there?

Check out http://www.Line6.com I know they have Delay Modeler cause my dad has one. It's only 14 secs. though. I can remember reading about a Boss or Korg sampler that is comming about that was long and better than the Lin6 one. Hope that helps, Sky