I've not bought stock coils in nearly five years. It makes sense for B&M's not to rebuildables as they'll never see a punter back that figures out how much a roll of wire and bag of cotton costs, how long it lasts for, and the money they save over stock coils. Also, there's an absolute glut of stuff hitting the market regularly that they're getting stuck with outdated stock as the next hyperbolic item comes to market - companies like Aspire etc who have multiple atomisers that take the same coil heads are a blessing for B&M's as they can tell clients they use the same coils as their old tanks which looks as if they're saving the customer money initially, but keeps them coming back for more coils.