Sherri Lynn,
Yep, when I bought P90X I bit the bullet and went for a pull-up bar. It's the kind you intall with small circular brackets in a doorway. I think it cost about $15 on Amazon.com. It works wonderfully, but I can't really do more than one unassisted pull-up or chin-up (okay, maybe 2 chins). I have to use a chair to help out, but this way I manage about 15-25 reps depending on type/set number. I couldn't even do one unassisted before P90X and now, even though I'm not doing a P90X rotation, I do my own sets of pull/chin-ups with my back work.
I think you'll find that they are a great upper body workout and that getting better at them will make you feel kind of tough}(
Mattea