Latitude/longitude based on postal codes

Hi all,
We have shipments worldwide and we don't have a distance engine that is supported worldwide. So we are looking at using the latitude/longitude to calculate the distance. To automatically add lat/long to the location, we need to populate the postal code lat long table with postal code, latitude and longitude.

Is anyone selling this data (Postal code, lat/long for entire world) which we can readily buy and upload in to OTM?

Thanks