You don’t need fancy tools to do push-ups but a decent set of push-up bars can help you push your body harder. Take the ProFit Push Up Bars for instance: it is a pair of push-up stands with foam/rubber grip that protects your wrists while you exercise.
The anti-slip rubber base grips to any surface, so you can exercise safely. These push-up bars can support up to 450lbs of weight. Costs under $15 at this time.