Find and return my son.

Hello, thank you for taking the time to read our story.  
I am a single father of a 6 year old boy. 
I was divorced close to two years ago from a woman from Colombia, South America, and since then my then step daughter and my son have been the center of my life. 
After being told in March 2014 by my ex that she was moving to Miami, FL and taking both children. I applied for full custody because I feel in the best interest of the children is that they stay close to their father, extended family as well as friends and school.  
In May of 2014 the court granted that my son live with me full time for the summer of 2014 after he finished kindergarten. This, after his bological mom had been found in contempt multiple times for interference of parent time.   
I have been in and out of court and spoken multiple law enforcement officers recently whom began investigating a possible missing persons/custodial interference case. 
I dropped my son off with his mom for the weekend on Friday Aug 15th, 2014, less than a week before he was to begin 1st grade. This same day I was unable to reach him, then recieving no response to phone calls, texts, voice message nor emails for then entire weekend.  Sunday Aug 17th, I called the police and requested a well child check-up. After about an hour I recieved a call from the officer only to be told that my ex had moved with no return address. Within the next 24 hours I found that she had; disconnected her cell phone, closed all social media accounts, quit her job and disapeard with no word.  Needless to say I was at the airport by the next day trying to get any information I could. TSA approached me and he said "I apologize, there is nothing I can do to help you". I thought at first it was because the airlines cannot release information for security.  But at that moment he set down in front of me airline tickets and said "It's to late". The tickets were for my ex-wife and my son traveling from Las Vegas, NV on Aug 16th, 2014 to arrive in Cartegena, Colombia in South America at about 2:00 AM Monday Aug 18th. As you can imagine my heart sunk and I was officially lost not knowing what to do. 
Over the last couple months various things have been brought to light.  From finding she had traveled in secret to Guatamalla where she got married to an individual who has been deported from the United States three times. We found the vehicle she was last seen driving after being abandoned for 2.5 months. This vehicle was in my name and given to her by the court at the time of the divorce.  This vehicle has has a balance of $10,800 and local dealers value this vehicle at $4,500.  I was told by the bank if I do not place full coverage insurance and pay the payment on this vehicle they will send me to collections and close my all my accounts, repoing any assets I have to recover funds for such.  Also we found multiple credit card applications in my name applied for from a hotel in Texas and an American Express applied for out of South America which was maxed out at $5,000. My ex fraudulently altered and deposited multiple checks overdrawing my bank account, and finding that she had overdrawn multiple bank accounts of her own collecting thousands of dollars to assist her in traveling.
I have incurred an estimated $15,000 in legal fees from March until now and my ex is still missing with my child.  I have been in touch with the FBI whom has been little to no help to this point.  I have been instructed I have to find a private investigator to locate my son and then, then will have to hire an attorney outside the united states to legal recover my child. The United States has suggested highley against me trying to recover my son on my own as it is highly dangerous and I could end up in a imprisoned in another country.
Will you please cosidering assisting me so I can continue searching for my son and bring him home.

Anything you are willing to donate will help.  
Thank you in advance.