Question about google maps or mapbox integration

Hi, wanted to ask you if you can help me with google maps not showing on my site, and therefore preventing the results from search and categories to show in the results, but i am not sure about this last thing if it is connected to google maps problem or if is a different problem. this is the site: https://veo.bg uses jquery and bootstrap if this is of any importance. Also i think it is a good idea to if you can replace google maps and itegrate on its place : mapbox which is similar but more cost effective i think : https://www.mapbox.com/pricing

And also if you can give me any esimate cost for this work what payment method you accept.