I did want to point a few things out on Karaoke Manufacturers some still alive and some who have gone defunct. Chartbuster started printing their disc in house using blank cdr media with special printers. Debbie and Norbert explained it cut costs on glass mastering.
Music Maestro even changed their product lines to a white disc and black lettering. Caryn and Aldo did this to cut costs for the same reasons.
DKKaraoke Millenium 115 Sets were even done the same way. I had contacted song factory to ask why a DKM set was copied and if I had been ripped off from a legitimate karaoke company. They explained that no, their reasons "to cut costs of glass mastering". Cutting costs on glass mastering.
Star Disc, Forever Hits, Top Hits Monthly and Stellar Pop Hits did the same.
I just recently got some new discs and they were directly printed on but not with a stamped label.
ALWAYS keep your receipt when buying karaoke. Many stores are anti-piracy and will explain why even Jewel cases moved to plastic sleeves.
The plastic sleeve movement happened when the USPS and Fedex etc. increased their pricing. It cut down on costs. If you get a disc set in paper sleeves, don't think you were ripped off. This is to help you not to pay as much for the order enabling you to buy more products.
When all else fails, there are the online download stores. KV - SBI Global and not to forget Sound Choice.