In 1993 I bought the bespoken Sound Blaster from 1989 on a flea market for around $60.
It was already considered old. It could only process 8bit sound, but the OPL voices chip was cream.
This Sound Blaster was also known as Sound Blaster 1.5 later, if I remember correctly.
Some months (sic!) ago I got an Sound Blaster 16 with SCSI interface at Ebay for $100. Oh man, the OPL2 chip has such a nice and warm sound. Superb quality. The additional SCSI interface makes this Sound Blaster perfect for retro computing.