350 handgun? This isn't ringing a bell. Please rephrase the question with a specific make and model of handgun you're interested in. The calibre really does little to determine the going price, except in cases where the cartridge is unique to one or a very limited selection of firearms.
It would be 350fps which means that the BBs fired from the gun travel 350 feet per second.
$300-$400 depending on condition and action-type. I bought a used Beretta for $350 that is Double Action Only. It is probably not as valuable as a full Double/Single model. I really enjoy my Beretta.
Between $40 and $350.
what model
5-500
100-350
38 caliber hand gun
60 dollars new. 30 used.
The most common hand gun used in James Bond is, The Walther PPK.
Impossible to answer. "Best" is a meaningless term until you quantify it. Are you talking about a long gun or a hand gun? New or used? What will it be used for?
depends on make, model and condition.
50 or so