I've been looking for a Sound Blaster 16 CT2920-card for some time now due to the fact that it's the most advanced Sound Blaster card that has plug-and-play while also having the least amount of bugs and issues. However, it doesn't really seem to come up on eBay.

Does anyone know if the card is unusually rare, or whether it does in fact come up from time to time?

Thanks in advance.