Until 2019 shipping small parts would always be cheapest by post.
Starting 2020 this is no longer the case, especially outside the EU.
Handling & shipping max 10 kgs EU, package (by post)
Shipping (within the EU) and handling of packages longer than 38 cm (about 1'3") weighing up to 5 kgs.
Insured shipping by post, if delivery time is less important than price.