Arhey trader mod works for me.
If you sell your crappy detector to the first trader (worth 500 ru) you get a cool 250,000 ru! So you can buy, buy, buy!!
Only problem is, when I press escape to save after first mission and after I bought all my goodies, the game crashes and reboots my computer.
Hmmm don't had any problems with it.
Sorry no idea why your game crashes...