A team I work with is currently in an unfortunate situation. They've spent a lot of time integrating the google map control on their site but they didn't discover that to run google maps on a https site you must license the control (and it isn't cheap) and the same goes for bing maps.
So my question is do you know of any cheaper/free map controls like google or bing maps?
Why can't they put the google maps part on a non-secure page or frame? The google licence says that you must have it on a publicly accessible site to benefit from the free version of the licence, so even on a http site, you may still need to pay for the data.
All other mapping tools are dependant on the expensive map source data, so you'll not find any. The exception is OpenStreetMap which uses community-supplied map data.