Hello @Jabit,
You can read more about our address best practices here, we recommend using Google autocomplete solution because we Google geocode on our side and so this is the best bet to avoid any address mis-match.
However, you may feel free to try some similar address validating tools which may be cheaper than Google, at Stuart we do not have any other particular recommendations but it’d be great if any members of this developer community could help!
Browsing around a little I come across ‘Here’ auto complete solution, I wonder if this could be of help.