Retail there is some starter kit available in the Health food shop above Tesco in Paul Street .
I have also got an ( unconfirmed ) rumour that O'Donovans OffLicence in Douglas is selling Kits for Homebrew .
As soon as you want to step up to Partial Mash / extract / All grain, your quest in earnest then begins and you will be sourcing stuff from everywhere .
Online Homebrew suppliers are very good ,
You'll also be looking in Homeware shops and engineering suppliers and the lot !!