Time to start strengthening up...

Many of the guys I work with developed workouts using whatever they could find when they were away from home.  One of the best seemed to be sandbags.  Cheap and simple and if you need it heavier you just wet the sand.  It's a bit primal but you can generate variations on all the major exercises (squat, lung, press, pull).  Certainly doesn't have to be expensive.

If you're looking for a great bodyweight workout, the menshealth site had a few a while back when I was looking for some.  it might be worth checking out.

I'd recommend the TRX as well.  Although I would ensure you have a good spot to use it before going that route.  I'm lucky, I hook mine up outside on my deck.  But, if you need to hook it over a door you need to do it on the opposite side it opens on so that you are pulling back into the door frame.  In this house I would have a hard time finding a good spot to do that and have room to workout, in other places no problem.  You could also get a ceiling mount though.

There are countless body weight exercises you could do though, even without the TRX.  I'd recommend getting an exercise ball as well.