Don't despair! I found a 130 kg one on Ebay mid last year for $400.
It was 'as new' owned by a sexy thin blonde woman that never bothered to use it.
I've used a few times since I was over 130, and haven't broken it. If you are just doing flat walking for 10-20 minutes a day you could probably add an extra 10kg to that. I think they rate them at maximum workout... running for example. That would come later.
I feel so lazy reading all this 'exercise talk' as I haven't done any besides walk the dog since I started this diet.
At my max weight I had so much fluid retention in my feet I could hardly walk! It does seem to be getting better though as I lose weight, so I hope to be able to use it again after another 5-10 kilos.