what you can do to get free furniture, is these simple steps:-
1) put an empty lot somewhere in your town (world editor..)
2) then Build/Buy on that lot
3) put all the furniture on that lot (it wont cost you!)
4) then go back to your sims
5) make sure your sim has the klaptomatic trait
6) at night, go tot that lot and steal everyhting you placed! easy!!
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Go to Buy Mode and grab the furniture you want to rotate then press the keys to rotate it.
If you mean real money, then no. You have to buy them in game, with Simoleons (Sim cash.)
Sims have to go potty.
No you cannot buy a gun on The Sims 3.
Well im not sure,but i think when you buy things eg. Furniture then you have to pay a tax on them and you also have to pay bills....