Due to the effect of COVID-19 on the shipping business, shipments are taking longer to reach their destination and the cost is increased. Current orders using registered airmail take an additional week to get delivered (total time 2-4 weeks). DHL orders seem to take up to 10 days instead of the usual 3-5 days. Registered airmail now costs 10 USD per order instead of the previous 5 USD. DHL orders are less affected and the increase is 1-2 USD per shipment depending on the destination.
Update 2020-05-23: The courier has updated that some airmail shipments may take up to 60 days to be delivered.