Is it the 5G signal booster will cost more ?

Yes, because the spectrum used by 5G is millimeter wave, and the millimeter wave devices and machines for manufacturing 5G signal amplifiers are very expensive, so the cost of 5G signal amplifiers may increase exponentially in the initial stage. As 5G technology matures, The cost will gradually drop to an acceptable level for the general people.

As the above result, an affordable consumer cellular signal booster may be available after 2025.