How much is it to purchase 4 x alloy wheels on average?

Its almost how long is a piece of string question...depends of the size of the wheels....the finish you want etc....can cost thousands....or a couple of hundred per wheel......you can have your present tyres put on.......why not use the spare wheel as a replacement and then just go and by another alloy as a spare...wont matter what it is as long as its the same size wheel.