Buying a Python .... 55.000.000 cr
Outfitting ............ 100.000.000 cr
Leaving supercruise like this ... PRICELESS

Outfitting ............ 100.000.000 cr
Leaving supercruise like this ... PRICELESS
Buying a Python .... 55.000.000 cr
Outfitting ............ 100.000.000 cr
Leaving supercruise like this ... PRICELESS
To do this on a regular basis aim for a point roughly halfway between the planetary body and the station. As you start to get close adjust your flight path towards the station, so that at the point of exiting SC the planetary body is behind you and the station is in front of you. More often than not you will be facing the mail slot (and I have had occasions when I could have docked only by matching the rotational speed of the station).
It would be nice if they had a back door on some stations.