Yep, B&Q bargain bin. £1. Adjustable spanners for £1 as well. They'll only rust to shit in a year anyway, so you might as well replace them once a season, so them being cack tools doesn't make a lot of difference!
Personally, the market will decide whether he's going to make a sale. Though I'm sure you have to be a service tech to swap a valve from DIN to A-clamp And once you've taken a slug out of one and had it in your toolkit you'll need to get it O2 cleaned if you want to use it with nitrox.
Yes mine was also £1 from B&Q, folds up like pen knife.
The hole punch thing, "make your own log sheets for your PADI folder" a padi log book is only £5! so you would need 5 log books to start making your money back.
How is this guy in buisness?!