I have a lot of jukebox reissues of 50s-60s music that were made in the 70s and 80s. Most don't have the original B-side, but instead "hits" on both sides (sometimes by different artists!) There was a market for them then; now most jukeboxes use CDs. Several companies specialized in pressing these, others came from the major labels themselves. I haven't looked for modern stuff but I suspect demand for reissues is much lower than 30 years ago...
Quite a few of the old ones are still available;
http://www.oldies.com/collection-view/7-Inch-Vinyl.html has a fairly big selection, and there are several other online vendors...
Best,
Mike