The cost will depend on what type of registration you’re seeking and whether you’ll need the assistance of a trademark attorney. The filing fee for a typical trademark is $225 and there are costs to file the trademark.
Businesses often seek the assistance of a lawyer to make sure their application gets accepted (which can be a time consuming process) and to avoid any future potential legal liability. You can of course check outto get it done for one low fixed fee.
Best of luck and happy to answer any questions you might have.