Douglas Electronics: 6-DE-104/8

The 6-DE-104/8 allows two 8-bit PC/104 boards to be mounted side-by-side  

http://www.douglas.com/hardware/pcbs/pc104/6de1048.html

Douglas Electronics: 6-DE-104+

The 6-DE-104+ extender adds height to a PC/104-Plus stack.  

http://www.douglas.com/hardware/pcbs/pc104/6de104+.html

Douglas Electronics: 6A-DE-63/104

The 6A-DE-63/104 allows 8 or 16-bit PC/104 modules to be used completely inside an ISA box  

http://www.douglas.com/hardware/pcbs/pc104/6ade63104.html

Douglas Electronics: 23-DE-104

The 23-DE-104 is a prototyping card for use with Intel386 EX Embedded Microprocessor Evaluation Boards  

http://www.douglas.com/hardware/pcbs/pc104/23de104.html

Douglas Electronics: 22-DE-104

The 22-DE-104 is a prototyping card in the PC/104 form-factor  

http://www.douglas.com/hardware/pcbs/pc104/22de104.html

Douglas Electronics: 22-DE-104+

The 22-DE-104+ breadboard gives you prototyping space in a PC/104-Plus stack.  

http://www.douglas.com/hardware/pcbs/pc104/22de104+.html

Douglas Electronics: Mini Boards

Douglas sells bare mini boards designed by Fred Martin of MIT.  

http://www.douglas.com/hardware/pcbs/miniboard.html

Douglas Electronics: Handy Boards

Douglas sells bare handy boards (and serial & battery charger boards) designed by Fred Martin of MIT.  

http://www.douglas.com/hardware/pcbs/handyboard.html