Substituting Pull-Up Bar With Resistance Bands For P90X?

I am doing P90X and I am going to be going away from home for the week and I have no way of take my pull up bar with me. I was wondering if Walmart has any resistance bands that will give me the same effects as a pull up bar, like what the people use in the P90X videos. I don't know anything about resistance... show more I am doing P90X and I am going to be going away from home for the week and I have no way of take my pull up bar with me. I was wondering if Walmart has any resistance bands that will give me the same effects as a pull up bar, like what the people use in the P90X videos. I don't know anything about resistance bands. I am 240lbs, 5'11".
Update: I have no way of ordering anything online. I may be able to go to a local fitness store like Dick's or something if necessary.
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