I'm working out with pushups, crunches, light dumbells, isometrics, stairclimbing, and lots of walking. I don't have a lot of time for going to the gym, so I like incorporating exercises into my daily routine with things I can do at home and at work.
Is anyone using low cost, low tech, portable fitness equipment, such as jump ropes, Bullworker, Bully Xtreme 2, elastic bands, etc?
I use a rebounder for running in place. I use the Body for Life 20 minute routine three times a week. I also do Oxycise for twenty minutes three times a week. I also add pushups and situps three times a week. I have been doing this routine for the last year.
I ordered the Bully Xtreme 2, but they took a look time before shipping and wouldn't respond to any of my email requests for shipping info, so I cancelled the order.
I'll stick with my dumbbells, walking, pushups, and crunches for now. I like the Body for Life routine. Here's a good site:
low cost fitness equipment? 
low tech equipment 
Linear Mode
