I would worry that getting to and from us would not work into an hour and give you time to sample and choose MrDeseVaper. Especially on a Saturday, it can be hard, even for a taxi, to get through the town centre one end to the other in Edinburgh. We do regularly post out to customers all over the UK or if you are just a little patient for a few weeks more we will get the website up and running. Failing that if you have more than an hour on your return trip, then please do come in and spend some time.
The quickest way to get to the shop from Princess Street is to hop on a train from Waverly to Haymarket (one stop). Come out of the station, turn right then first right again (Dalry Road), cross over the road and take a bus. I think all of the buses continue along Dalry Road onto Gorgie Road as it is one very long continuous road. Ask them to let you off at the City Farm which is about 6 stops or so. Get off the bus there, look across the road and voila, we are there.
Alternatively if you message Lindsay Ross on our Facebook page; he is an Edinburgh City black cab driver, he can possibly give you a better indication of how fast it is possible to get you to and from the bus station. He may also be on duty today. He spends a lot of time in the shop so if he picked you up he would stay with you and take you back.
Good Luck and it will be nice to see you if you do make it today. Sons no 2 and 3 will be there to serve you and Freja the pup if she is not out on her walk.