Symbol group Nisa-Today's notched up record sales in the week leading up to Christmas despite the “challenging economic environment”.

The retailer reported a 17.7 per cent increase in sales under its Christmas Price Buster promotion, despite a 30 per cent shorter running time from the previous year.

Year-on-year growth by volume was up 11 per cent for ambient food, 2.3 per cent for chilled food and 7 per cent for frozen foods. Sales for licensed and confectionery categories increased 6.6 per cent and 17 per cent respectively.

Nisa-Today's said it has invested in each of its categories in line with its business plan and sacrificed a degree of profitability to support sales.