I currently offer TWO sets of jam tracks for instant download:

BLUES HARP JAM TRACKS, Vol. 1  (acoustic)

http://www.tradebit.com/filedetail.php/2839291-blues-harmonica-jam-tracks-vol-1-zip

BLUES HARMONICA PLAY ALONG SESSIONS, Vol. 1 (electric)

[note:  this set of jam tracks also includes a one-hour video tutorial on how to make the best use of each track]

http://www.tradebit.com/filedetail.php/4537012-blues-harmonica-play-along-sessions-zip

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If you're interested in JAZZ/FUNK jam tracks, you might want to check out the amazingly diverse array of jam tracks for horn players available from the "PlayJazzNow" site:

http://www.playjazznow.com/horns.html#jazzfunk

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.............and harmonicas, of course!  You can't jam along without an axe.  Click the icon below; it's the model I've been playing for more than 30 years: