Thank you for your reply, IrisCole.
It is actually not ebay & paypal transaction. So I'm free from $750 rule!
I'm planning to use UPS. When I got a shipping quote online, I was not sure if the shipping insurance was included or not. Also I remembered someone said the online insurance quote and a phsyical UPS store's insurance cost is very different. Somehow I can't open their online account because of my address. I have to go to their store. Just in case it's very expensive, I would like to know an alternative option.
I thought it was shipsurance. I checked them long time ago, when I heard about it. But it looked different and also they don't cover Mexico. I hope someone knows a different company.