Commodore 64 DTV with mod - what a price or can anybody sell?

Hi!

I'm interest in Commodore 64 DTV.
Want to buy one, but don't know any price.
What exactly?
Commodore 64 DTV with IEC connector, PS/2 keyboard connector and built in JiffyDOS.
If is possible to flash DTV ROM, it will be pretty nice...
Can anybody explain me what is possible and what not also how much money I need?

Thank you all.
Miro