That is a loaded questions. All of this is in USD.
Small cells can run from $2,000 and up and a macro BTS can run from $50,000 and up for the hardware only.
The thing is, that is only part of the cost.
Installation for a small cell may be another $1,000 or more, then you need to install fiber or wireless backhaul, could be another $1,000 or more and then you have the OpEx which is the monthly cost of $500 and up. You also have site acquisition which can run well over $10,000 for access to the site.
For a macro BTS the installation will probably be $30,000 and up. Site acquisition will run well over $20,000 per site. Backhaul installation will probably be over $5,000 a site. OpEx will be over $1,000 per month per site and the backhaul will probably be over $1,500 per month per site.
There are many variations and so much of the cost is location dependent. The specific site matters. Rooftop versus tower versus stealth.