There are no more being produced, about 2000 were produced and no more production in the foreseeable future.
Krink kits are going for $900, the 107 ur is a factory krink, so do the math. I bought mine new for $1500, 2 magazines through that thing is nothing I'd say $1400 is a fair price. If he really needs the money fast $12-1300.00 easy.
If you get it for less, its a steal. The 107ur won't stay on gunbroker for more than a day at $1400.00