You do not need a lot of money to do either chip-off or JTAG.
The process is not brain surgery, but does require practice, and some electronics understanding.
For JTAG, take a look at OpenOCD and any of the UART solutions that works with it. I use the Bus Pirate by Dangerous Prototypes - $30.
So for Maybe $50, you can get a JTAG kit going. It is not push button, but it works, and is well documented. I have JTAGed with such setup many embeded systems like cell phones, tablets, elevators, security systems, and such.
For chip-off, you will need soldering kit, the right EZ Schmartboard, the chip docs, and some code to talk to the chip. If you are specializing on NAND, take a look at the ONFi site for reference - important pin out details can help in hacking together your proto board.
I have done most non-monolithic flash drives in such fashion.
The resulting data is different for JTAG and chip-off. You will have to understand each, and work your way back up sometimes from the physical layer to the file system. Not always fun or easy, but rewarding.
Training, or watching someone else doing this does come handy.
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