I recently ordered a pistol from a large east coast online seller. When I saw the paperwork at the receiving FFL, the pistol was shipped from a wholesaler in Missouri. Another transaction the online dealer was in Oklahoma and the pistol was sent from a wholesaler in the Twin Cities area. In both cases the pistols I bought were obsolete models that had been sitting for a while, both were NIB.
I'm not worried about where the pistol is being shipped from, as long as the transaction is legal. I also use credit cards so that if the transaction goes south, I can file a dispute easier. This has never happened to me up to this point.
In both cases I was given a tracking number and I could track the progress of the shipment. This went a long way in giving me peace of mind during the process.
Good luck and may your SP-01 perform beyond your expectations