Thanks for the input! I'd seen the NEMO site, but I wasn't sure if out of stock meant they hadn't started making them yet or whether they were just sold out. I'll definitely ask around and let you all know what comes up... From looking at the designs it looks like they got the weight down by making it non-freestanding by eliminating one of the cross poles and just using stakes to hold out the corners, but even with that, I was surprised by the weight too!
Thanks again!