Found a listing of PCMCIA audio cards from Access Micro's old website. I believe they don't carry any of the listed items any longer, but I figure I'll post it here anyway.
New Media GameJammer PCMCIA Sound Card 8Bit-DAC INT Speaker Joystick Port $182.00
New Media PCMCIA Multimedia Combo Card-WaveJammer,BusToaster,SCSI AD $338.00
New Media PCMCIA WaveJammer 16Bit-Bus,16Bit-DAC $210.00
Ositech Comm. PCMCIA Diamond 16BIT Sound Card With Ethernet 10BT $310.00
Ositech Comm. PCMCIA Diamond 16BIT Sound Card Ethernet 10BT/2 $355.00
Digital Equipment 16 Bit PCMCIA Sound Adapter For HiNote $290.00
Eiger Labs PCMCIA Audio Card 16Bit Sound Blaster Compt MIDI Type2 $143.00