How much does a portable wifi router cost when traveling abroad?

There are two types of routers that you carry with you:

4G wireless router, which is a wireless router that requires a 4G network card. It comes with a mobile power supply and costs around 300-700. The price of a mobile power supply is between 100-200, but the same problem between these two is that the Internet card must be able to be used after going abroad.

Ordinary portable wireless routers can be portable routers or network cards plugged into the computer like 360 ??portable wifi. The price is generally less than 100 yuan