How expensive is it to to install a small wall safe in my apartment?

I want to buy and install a small wall safe in my condo – nothing enormous, just enough to hole a few items of jewelry and some important papers. Probably no more than a couple cubic feet of space. Assuming I buy the safe myself, roughly how much would installing it cost?

You need to give more information, what type of walls you have & what thickness are they, is installation on interior wall or exterior wall ??? Keep in mind condo common walls are not yours alone !!! So interior walls are better & best suited. You can have a special wall made to fit such a unit, 1 or 2 cubic feet. If Brick walls need to make a cavity. Costs vary. $500 to $1,000. Also your location, elevator available or going on stairs.