I have heard once, my friend from Australia, complaining that sending domestic packages there is more expensive than getting something sent from abroad. I guess some countries have them more expensive than the others.
Anyway, I did send quite a lot of postages back then, and finding this chart pretty useful. It’s a chart of Indonesia’s Universal Postal Service Rates (the most friendliest set, price-wise. Non-EMS, untracked, haha). It is the chart in IDR (Indonesian Rupiah). Right now (when I’m writing this, ofc) 1 USD is about Rp 13.000,00. Usually I just round it up to 15000 or down to 10000 to make calculation easier in my head.