Cheap accelerometer in DIP package?
Well I presume you want a DIP for rapid prototyping needs and you can't work with SMDs,
So check out sparkfun's tutorial they have a very comprehensive list!
http://www.sparkfun.com/tutorials/167 (many are outdated though)
The cheapest one I could find is this : http://www.sparkfun.com/products/10955

I'm not sure if you want a tilt sensor or an accelerometer, if you just need to differentiate between two discrete positions, you might do well with a mercury/ball tilt sensor : http://www.adafruit.com/products/173  Pros:Cheap and easy to use/interface. Cons: its a binary output, acts like a switch.