There are some cheaper options, like LocationIQ. But we actually support Geoapify as well. You would need a config like this:
<entry key='geocoder.enable'>true</entry>
<entry key='geocoder.type'>geoapify</entry>
<entry key='geocoder.key'>YOUR API KEY</entry>
How can I use https://www.geoapify.com/ as my geocode service.
This API offers very competitive pricing.
Thanks