Unfortunately, $700 sounds pretty reasonable. The actual freight is probably around $200 or so (just guessing), but there is a lot of paperwork, and broker fees are high. I never export small shipments, because it costs about the same to send one small or medium reptile as to send 100 of them. It just isn't worthwhile to spend that much money, at least, not for most people. On top of that, as far as I know, iguanas are CITES animals. I usually export non CITES, such as corn snakes. So you will have even more paperwork and expense than if you were shipping corns.
You can contact Rob at Glades Herp (
www.gherp.com). He exports for a fee. But I would be very surprised if he will be much, if any, cheaper than the $700 you already found. If you already had an export permit of your own ($100 / yr), you could contact any broker directly. The broker would probably charge you $200 - $300 for paperwork and getting it inspected ($55 inspection fee). Plus you may need a vet health certificate too. Plus the cost of freight. And you would have to get it to Miami or NY or whatever port city the broker is in. And you would still have to deal with CITES (unless I am wrong and iggys are not CITES). I can't help you with that part, and neither could a "general" type broker, only a reptile exporter. If you are not willing to spend at least $500 (probably more), it probably is not worth pursuing other options. It is really a big headache, and expensive.
All of this expense is mostly due to government red tape, not the actual cost of getting an animal from one place to the other. Unfortunately, it is just the way it works these days. The red tape certainly slows (and eliminates) many business deals during this slow economy, but it is what we have to deal with to stay in business.