Paid for them and noticed another lady at another checkout said that she was overcharged at the wrong price of $1.99 per kilo... Checked my receipt and sure enough, I had been charged the wrong price too...
Went back to my checkout operator and he refunded me the whole lot as it is store policy to refund all of what was wrongly priced... Tried to pay for them at the correct price but my money was no good :)
So ended up with $10 worth of beautiful grapes for $0! Woohoo, thanks Aldi!