is offering a free SimpliCam [simplisafe.com]
($99 value) this weekend with any new system. You should see a prompt to add it to your cart when on the custom build page.
You can build your own system and get away with $199 as the lowest possible price. You need to add at least one entry sensor to the base unit before being allowed to checkout.
They offer different monthly monitoring prices ranging from $15-$25 a month but these are not required
. You could always just add a 105db siren to scare the turds out of any baddies that dare enter.