$100k sounds mighty excessive, the norm (for jets anyway) was always around 30k.
Depending where you are coming from experience wise it might not be a problem in practice. I mean, if you have only 500hrs on joining then you're unlikley to be going anwhere vastly greener inside two years anyway.
You could always turn it down and spend a few more months waiting for something else when you could have otherwise been a decent way through serving the bond.