RVF750
I'm doing a bonded type rating on a regional turboprop and I've seen the invoice of what my airline are paying the TR provider (my bond is a lot less though), it's over double your estimate, not including hotel accommodation, meal allowances and flights they're also forking out on
I do think it's poor form for people to bail out on companies who bond candidates rather than ask for up front fees, we are the first to criticise airlines who charge for the rating. Those bonding people should be commended, not left with a bitter taste in their mouths and managers determined to make every future pilot pay.