All of these products and consumables are available from Micro Technology.
Earol Olive Oil Spray
Earol Olive Oil Spray £9.50 inc. P&P

Disposable Batteries
Disposable Batteries £4 per sleeve/£30 per box plus P&P.
Wax Guards/Filters
Hearing Aid Wax Filters/Guards £10 per packet plus P&P*
Hearing Aid Domes
Hearing Aid Domes £15 per box plus P&P*

* For some hearing aid manufacturers, this cost may be more