'The last digit on the barcode changes after every new season,' she said.
'So if there are two toasters that look exactly the same and the last digit of one barcode is eight and the other is nine, the one with the eight should be cheaper.’
She adds: 'It has to be the same model, they just tweak the product and the price I found doesn't come up straight away on the system.'
Rita also handed out tips for landing huge markdowns - saying that it’s best to trawl through the store looking for bargains.
'A lot of the stock will always change in price,' she said. 'If it's something that isn't in the catalogue but it has been in the store for a long time, especially clothes, they can sometimes go on sale for as little as $1.
'There was a time when every single book was discounted to 20 cents. I bought about 20 books.
'So if you're into flipping items make sure you keep checking clothes, books and makeup as well.'
She adds that it’s best to shop between 8am and 5pm - “This is when the full-time and very experienced staff members are working, so they are more able to answer your questions” - and that the clothing, books and makeup sections have the best reductions.
‘The best bargains are right after Christmas and after Easter,' Rita said.
'On Boxing Day there's a whole section that drops down to between five cents and $5 but it is usually wiped out on Boxing Day by customers so it's good to come in early.
'In between campaign periods like "Back To School" they would mark things down because it's not as busy but a lot of the times, quite randomly, they will slash the prices of a bulk number of books, clothes or appliances.
'It's usually when a newer model/garment has been updated, fixed or isn't selling.
'The price will drop down drastically but the item doesn't really change by much.'