This is an interesting place to visit. All the locals recommend a visit here as it's the largest undercover market in the Southern Hemisphere. There is a range of stalls, mostly fresh food, eateries, delis and cafes. But there's also some other crafts, flowers, art and antiques. You will definitely find something to take your interest. I can't comment on the pricing though, I'm not sure about that. It would be a good thing to do on a rainy or cold day. It's not open on Sundays, that's a shame.
Adelaidians are so lucky to have the Adelaide Central Market and the fact that there are still times that it is so busy that you can barely move is a testament to the ongoing popularty of it. Under one roof you can find pretty much any ingredient that you could possibly want. Plus a huge variety of stalls selling delicious things to eat. Plus restaurants and cafes. Definitely an easy place to spend a couple of hours.