Essential oils?

Does anyone know where you can buy essential oils locally? I’m in honor oak so preferably here, crofton park or forest hill. Need to get some peppermint oil today to get rid of a cat smell (a neighbourhood cat came into our house yesterday and marked its territory! Apparently peppermint oil or vinegar best for getting rid of smells and I think I’d prefer the smell of peppermint!

The Mind Body Therapy Centre on Stansted road does. They are a massage clinic but have a small shop selling essential oils and other things

Thanks! Just been and collected some.