Here is a description of the possible shipping methods in brief:
In relation to the price of international parcel post and airfreight, the price is very high. However, it is the best way if you are in urgent need and time is the most important issue.
This option is the same as 'standard' for all countries outside EU. Depending on the weight and your location inside EU it can be a little cheaper than UPS ground; however the runtime is between 3 and 5 workdays. Parcels connot be traced on the internet. The table shows the cost for weights up to 40 kg / 88 lbs (2 parcels with more than 20 kg/44lbs). For countries outside EU see the table above. Please note that some EU countries have higher prices. Sending higher weight with more than four parcels is not reasonable. In this case other options will be less expensive.
DHL Air Parcel service is available for all countries on the planet, but like international parcel post, the weight per parcel is limited to 20 kg/44 lbs. Depending on your location it is faster than international parcel post that can take up to 15 days but the cost is higher. Average runtime is 6 to 9 work days, weekends excluded. This option makes only sense if you are not resident in the EU and the weight of the shipment is below 40 kg/88 lbs. Depending on the destination country, although with a weight in the range of 40 kg/88lbs, airfreight might be less expensive. If more than two parcels are needed for the entire shipment, airfreight is the better option anyway. Shipment cannot be traced on the internet.
This option makes only sense if the weight is a lot higher than 40 kg and you are resident far away from Germany. For USA, Canada, South America, Africa, Australia and Asia airfreight is the appropriate shipping method if the total weight a lot higher than 40 kg or if a single device, like a big power supply, exceeds 40 kg.
If you are resident in Europe and the total weight of your purchase exceeds 70 kg, transport by a forwarding agency is the best and cheapest method. Outside Europe, airfreight is the appropriate method for higher weights.