Hey there,
You may get many emotionally charged replies to your post, because for many of us (myself included) reading what you wrote is like coming face to face with the previous owners of our adopted iguanas. My ig Bud came to me with three of four limbs broken in multiple places, one break being sustained in "a fall from a table." Not to mention mites, obstructed gut, gangrene, and severe calcium deficiency disease...
That being said, it's good you're looking for help, and if your vet were going to send you home with an ice pack and a bandaid, it would not cost anywhere NEAR $350. Now, you will be charged simply for your time with a vet, before any treatments. My vet charges about $45 for walking in the door, and prices in general that I've heard are from $35- $55 just to see an exotic.
Your ig will probably need x-rays. The cost for that was $80 for two views. It may need the leg splinted, or may need calcium shots or prescription liquid supplement, which were relatively inexpensive: something like $18 for the shot, $7 or $8 for the liquid calcium. You'll need x-rays and a vet visit anywhere from six weeks to six months later, depending on the severity of the break, so that's another $40 to $80.
I guarantee you, if your iguana is walking funny, it has an injury that needs treatment. They make every effort NOT to show injury, to avoid predators who pick off the weak. While he heals, you're going to have to restrict his roaming time and climbing. At worst, this is going to run you around $230. You should HOPE the vet sends you away with no broken bone diagnosis, because then it's only going to be around $85 total.
What I would be saying to myself is, "Get out the wallet, cause it's you're own fault for not watching him carefully", but these accidents happen to everybody, no matter how careful. The thing is, EVERBODY here would take his iguana to the vet for something like this, so most likely you're not going to get any homespun folk remedies or "Easy Ways to Cure Your Ig". 
Do you have a vet? If not, and you have questions, this is a good place to ask them.
If you can't handle the responsibility of vet bills and having an iguana, then check out the Green Iguana Society's web page to start the adoption process. You would house the iguana while people responded to a listing for him on the website. But since almost nobody wants to adopt iguanas, it could take a very long time. So you're going to have to shoulder the cost of this vet bill.
Sorry this may sound a little low on sympathy, but I just want to let you know the truth. You gotta realize, even those of us who bought an ig on a whim or adopted one with no idea what we were getting into, made adjustments to our budgets and sacrifices and take great pride in the excellent condition of iguanas we've cared for and rehabbed. Many of us are teenagers, or like myself, just out of college and extremely low on extra money. But we do it anyway. So this is what you're going to hear a lot: FIND A WAY.
Any way that we can help or answer questions, we would love to. Write back and let us know, okay?
-Erin