My sister in law's parents have a Jack Russell Terrier and can't keep the dog anymore (Father is not feeling well and they can't give the dog the proper attention anymore). He is 6 yrs old (named Benjamin) light brown and white, w/ "mickey mouse" markings on his back. He's a very active dog and loves to be outside. No health problems, shots are up to date and has been neutered. The humane society will have to put him down very soon if they cannot find a good home.
Unfortunately, I do not have pictures but I can put you in touch with someone if you PM your number.
UPDATE#1: I talked to my sister in law. She said the Jack Russell is great with other dogs despite what the other post says. Benjamin plays with a neighbour dog who is 2-3 times his size without any problems.
UPDATE#2: Dog is good with kids.