I suggest you take the monitor apart, the motherboard, processor, memory and hard disk are packaged separately, and the chassis and power supply are separated.
Let's talk about the monitor first. Wrap several layers in bubble bags, preferably the kind with big bubbles (the bigger the bubbles, the better the anti-falling effect), wrap them around several times, then put them into cartons, and then stuff the cartons with foam (that is, those white pieces that are sent by buying new home appliances). The more floors, the better the anti-shock and anti-fall effect.
Other key components are wrapped in sponge cloth and foam plastic bags before being put into empty boxes. All the extra places are plugged with foam to avoid it shaking too much during transportation. Then put the box into a carton.
The chassis and monitor should be about the same size, right? Then stick the two packed cartons together with tape, and write "fragile" and "handle with care" with a marker. Don't expect express delivery to guarantee that it's not bad, just pack it yourself.
If you want to be fast, relatively safe and at ease, you can choose to send SF or postal EMS, but the freight rates of these two companies are relatively high. If you want to be cheap, you can consider these express delivery services, such as Shentong/Tong Yuan/Zhongtong/Huitong/Dayun/Tian Tian. Freight is charged by weight. From Ningde to Ningbo, the first weight is within 8-1 kg, and the second weight is 4-6 yuan. For example, 9 kilograms, the freight range is between 40 and 60. Often send or a particularly large quantity can bargain, depending on whether you often send, your familiarity with the courier, and your bargaining power.