Anyone who pays that fee is obviously an idiot. Just go to reputable agencies like rishworth / parc, or for the far East maybe APAS is a good place to start. Legitimate agencies earn money as 'finders fees' paid by from airlines or they are paid to look after recruitment in its entirety.
Quite a lot of airlines might ask for a fee to attend an interview, it's a pain but if you are good enough to get through then think of it as an investment.