Off the top of my head...
$150 for used tank & stand w/ strip light, gravel, some rocks...
~$100 to AH-Supply for 96W 6700K retrofit kit & bulb
~$100 for Eheim 2215 w/ media
~$18 for Visitherm Stealth 200W heater
~$15 API FW master test kit
~$13 for 3 nice DW pieces from ebay (only 2 of which are in the tank)
~$22 for pool filter sand (50#x2, at least half of bag 2 remains)
~$80 for initial fish/plant purchases
~$50 food, long tweezers, Dry Ferts kit (rexgrigg), Excel, Prime etc. etc.
CO2 system, dropchecker and legs for light are all DIY.
So, if you want to throw in a few bags of sugar or bill me for some lab sundries, I may be in it $500, but it's nearly self sustaining right now as I've been selling some of my excess crypts and other plants (or trading them for other plants).