I would give advice but...
I am not a shop.
Vaping kit. Buy in bulk from China, wait 4 weeks for it to turn up then ship it on for double the price with next day delivery.
Quite a lot of competition out there for vaping supplies. Do you think it's viable?
This would be an amazing pitch on Dragons' Den.
"Hi, I'm looking for £250,000 to start my online shop."
"Ok, what will you be selling?"
"I don't know, what do you think I should sell?"
Extended, awkward pause, accentuated by editing and camera cuts
And scene.