What do they have underfoot if it's not grass and not mud? Just curious!
I get the Marriages on line from Farm & Pet Place. They charge £2.50 for delivery of a 20kg sack but, like you, otherwise I'd have to drive miles. For the Flubenvet one, they have a vet call you up just to check usage but I find they just run through everything to comply with the regs. Delivery is really fast too.
H