Total cost:
Used MKII 35mm = $4,700
Upgrade to MKIII = $2,500
TOTAL COST = $7,200
That came with no accessories though, so I also bought an external battery pack and a DVR from Ultimate Night Vision (from whom I also ordered the upgrade). The DVR is running about $200 and the battery pack a whopping $330 with all the cables, etc. So that adds over $500 extra. OTOH, since I got the MKII used I didn't pay sales tax on it. That saved almost $400!