Most couples try in the beginning to find surrogates in their country unfortunately due to the legal difficulties or prohibitions they turn to overseas services in USA or Canada to start their families quicker and safer.
Find a surrogate mother in USA can be much simpler than finding a surrogate in Canada or in the United Kingdom. For example, surrogacy agencies in USA can recruit surrogates offering considerable incentives due to the fact commercial surrogacy is legal in the United States.
What to look for in a surrogate or gestational carrier.
More info about surrogacy