Residents in Mitcham, Stirling and Aldinga have slammed the government's objection process saying it snuffs out locals' chance to have a say.
Mitcham residents were given only 10 days to submit objections against the planned construction.
At Blackwood, more than 150 complaint letters were written by locals - but their objections were to no avail, inadmissible to the state planning commission.
If residents lived more than 60 metres from the site, their complaints could not be submitted.
John Hill, from the Stirling residents' association, says the land set aside in the area is not zoned for such a development.
He says modelling shows traffic will increase by 50 per cent should the supermarket open.
Local grocers have also voiced their concerns, saying South Australian small businesses will suffer when the giant arrives.
"Why would you want to open up so many stores and take so much market share from the little guys?" said one Stirling greengrocer.
"Guess where those profits are going? Back to Germany."
While ALDI's prices are some of the most competitive on the market, locals say another price - the cost of poor planning - isn't on the supermarket giant's checkout.