The stair machine is a great one, so are squats, lunges, sideways lunges, and dancing.
I am not sure where you live but you can probably find a gym that has a wall or something similar in your part of the world. Hell there's even a wall in Dick's Sporting Goods here, though I'm sure it's not a wall meant for regular climbing.
I use climbing as my total body exercise now, going four times a week, and yeah, I see a very noticable difference now from the middle of August (yes, you read that right, MID August). My back, shoulders, and calves are MUCH more defined and there are definite improvements in overall body fat percentages and muscle structure. I HIGHLY recommend it.