Rob your neighbour and sell all THEIR stuff on eBay so there's no initial outlay of any kind. Also, if you happen to find a pedigree dog whilst rifling through their home, start doing that con trick with the dog in a bar. Double score.
Oooooooh it's an invisible signature... oooooooooh!!
"Life... it's the name of the game, and I want to play the game with you!"
Even better, Rob their stuff, wait for them to get suitably depressed about it, then sell THEIR stuff back to them at a small cost. Actual profit and instant gratification.
About as reliable as dice. Schizophrenic dice.