I have a friend in HK who is in his 50s and has had the op. His SO is much younger but was running short of time and went down the donor route in Hong Kong (not so far to go).
IVF is very cheap in Taiwan but I think you need to prove that you are married to the donor (some crafty handwork on your hubbies part might suffice) otherwise you will need to consider that HK is more expensive and the US is VERY expensive by comparison to Taiwan.
My friend btw is very attached to his daughter, despite having serious misgivings about it all before the fact.