speed cameras

where is the best source for obtaining these for the tomtom one?

pocketgpsworld. There is a charge of £2 per month or £19 per year.

If you find a new, moved or removed camera, not including mobile cameras, and you are the first to report it, you could be offered FREE lifetime membership.

If you download POIEdit you can get the January cameras free. Be aware they are now out of date but it will give you a taste of how good theirs are.