"Depends what you buy. I was going to get a jersey online but worked out cheaper at Bicycle Express and then got a set of wheels cos tho a couple of hundred more expensive than eBay, they had the knowledge to explain which is best to get and why.
Welcome to Adelaide Cyclists. You might be interested in joining AC group Commuters and, if you cycle in the city, Adelaide BUG. I coordinate four AC groups with emphasis on improving cycling conditions: Adelaide BUG, Prospect BUG, Look For Cyclists and Vote For Cyclists. There is more info in the introduction on each group web page.