Meet the Fitlaya Upper Body Trainer: a portable workout device designed to work your chest, arms, shoulders, back, and ab muscles. You can adjust the resistance level from 70 to 180lbs. It has non-slip handles too.
The device has 4 x 17.5lb springs in the inner layer and 4 x 27.5lb springs in the outer layer. Sets you back under $35 at this time.