I also have a mesh pen from Ebay which may be similar to what your looking at:
Zebra Pet Dog Cat Tent Puppy Playpen Exercise Pen L - eBay (item 280498315092 end time Apr-28-10 15:33:06 PDT)
Its been great for travel but I don't use it too much at home because I worry my pups will chew right threw it when I'm not looking
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This is exactly like the one I was looking at!!!
I just cant decide if I want to get a wire crate... What about the excercise pens that look like real baby play pens?