put 2 chairs together, back facing eachother and you can do dips

Buy a regular pair of $20-30 dumbells, you can do many exercises with those such as weighted sit ups, squats or jump squats, etc

If you have the space and the extra cash buy a bench which can be changed into a flat and incline bench and a set of weights which comes with 2 dumbells, 1 long bar and 110 pound worth of weighted plates. In total it should cost about $350 at most, and by doing this, you can not only get toned but, increase muscle size as well. It's cheap and time consuming because you don't have to drive out to the gym and you can work out anytime you want at home.