I'm a non-driving city girl! I can't even get to an Asda for Cholula sauce, never mind a Costo (Don't you have to pay annual membership fees for Costco?) And I don't have a garden, or even a sun-facing window.

Hopefully the suggestion will help someone else, but for me it would be simpler to have my faher-in-law send a few packets of a recommendation over by post than attempt to get to a Costco using public transport and a wheelchair. I wouldn't trust said otousan's judgement though. I love him to bits, but his tea is appalling! (I poured some into a flowerpot during my last visit, only to then realise that the flowers were fake... )