Does anyone have an idea where I might find a used training collar? I have a 9 month old lab who is starting to have some behavioral issues and doesn't listen when I tell him to come. He recently got away from me at the dog beach and jumped on several people before someone was able to grab him for me. Or what are some good ones that don't cost a lot? Ideally I can find a used one because I don't anticipate using very long and therefore don't want to spend lots of money for something I won't use much.
Although I'm an avid fan of training collars for certain purposes like proofing certain 'distance' exercises, I must say there are better ways of traning a dog not to jump. Particularly with ecollars, timing and proper use are essential or the dog can easily be negatively impacted by the experience.
First thing I would do in your case, is to train a recall command. He won't be jumping on people if he gets away from you again if you can just say "come" and he returns to your side....
As far as the jumping, one of the best ways to do this is to get some freinds to help you, and at home or in your yard, have them approach and if he jumps and acts all nuts, you command him to sit. They can protect themselves while he is jumping by putting a knee up (don't 'knee' the dog, just raise the knee and if he jumps into it well oops on him). Once he settles and sits on command, the pet and you praise. Of course, this only works if he knows 'sit' and responds reliably.
Keep your patience, 5 seconds of anger can destroy 10 years of training. If you start working on this on your own or even with a trainer, if you get frustrated put the dog up and cool of before continuing. Training a dog to the point of reliability is a lot of work, particularly if you want the dog to retain his trust of you, and not respond out of fear.
If you work on the recall, never reprimand the dog if he comes back on his own... returning is always good even if it takes a while. He needs to understand before a correction or reprimand can be effective, otherwise it's confusing (IE if I was screaming and threatening would you come to me?). Bait him to come back, whether with toy, food, run from him, etc when he comes, praise and reward. Once he understands you'll know it.
Anyway, I know that was a lot of scattered thoughts but I hope something helped, LOL.
If you get to the point where you want to use a remote collar, I'd suggest
Unleashed Technologies (uses intense vibration, more of an attention getter than a correction), or I use a Sport Dog 1800, that's probably overkill for you but I've had the same one for 6 years and love it. Just remember, if you use an ecollar, the dog should not vocalize in pain... use the minimum setting you need to get a response. My dogs, the only way to tell I've made a correction is they twitch an ear. Just make sure you have someone who knows what they are doing help you so you don't break your dogs trust, which you can easily do if you use them wrong...
. We still laugh about this to this day 
