This is not the place to discuss USPS shipping prices, this is to discuss the Arrow engine.
But to answer your question, the shipping prices are calculated by Ebay, not the seller.
http://payments.ebay.com/ws/eBayISAP...pingCalculator
We just enter the weight and size of the item - no prices. Total shipping costs calculated by Ebay during checkout includes handling fee, insurance, ect, so the price will be more then the base rate online.
1st class international and flat rate priority do not provide tacking #'s, and can take up to 90 days for delivery. That makes the buyer very angry and causes them to leave negative feedback and open complaints/cases with Ebay and Paypal against the seller even though the seller has nothing to do with shipping rates or slow shipping times. Be very careful when using anything less then regular USPS Priority Mail shipping, because if your package is lost, it can't be found and no insurance is offered by USPS, so you will be out of luck and out $200+.
I shipped one package to China in a Flat Rate box, and it took 6 months to arrive there. By then I had already refunded the money to the buyer and was out $90 for the lost item. I refuse to lose money again because of shipping problems, so we will not refund anything else due to lost mail. Use cheap shipping at your own risk!