There's a parts/supplier sticky at the top of the Corolla Forum, For car care look at Inside & Out, etc it's all there. Whether you buy it from trdsales.com or in Victoria or from MrRevhead in NZ, all the TRD CAI's come from the US and given everyone has a mark up, they will all be priced around the $500 mark. AEM will again be from the US but a little cheaper, same with Injen. If you want cheaper, check E-bay. If members haven't purchased from trdsales.com or others, they've found theirs new or second hand on e-bay. But unless they're a generic immitation, none are 'Cheap'. I think the lowest someone has paid is around $250 for an Injen, second hand or a New Simota.