What features are using? Bing, Here and Mapbox all provide good products (as do a bunch of smaller map providers), but pricing varies a lot based on what you are trying to do.
If you need well-maintained mobile SDKs, Mapbox's pricing model is a lot more straightforward. If all you need is basic mapping on the web, OpenStreetMap is adequate.
hey! would love to chat with you about mapbox - what's the best way to get in touch? feel free to send me a note here - help@mapbox.com<p>-Vanessa