DIP switch replacement
Because your board will be used by internal engineers and infrequently changed, I suggest a solder-based or track-cutting solution. 

A pair of pads on your PCB make a fine switch, and there's nothing that could be cheaper.  Touch it with your soldering iron and some solder, and you've made a connection.  Touch it with the iron and some braid and you've disconnected it.

If you want it to default to 'on' and you're using stencil + reflow soldering, just add some paste over the whole area and it will short during reflow.

Sparkfun's library has a few examples, they look like this:



They can be quite small; an 0402 resistor footprint works fine for this purpose and takes up far less space on your PCB than a DIP switch.