Later problems occurred when ONdigital began to sell prepaid set-top boxes (under the name ONprepaid) from November 1999. This bundle sold in high street stores and supermarkets at a price that included – in theory – the set-top box on loan and the first year's subscription package.[24] These prepaid boxes amounted to 50% of sales in December 1999.[25] Thousands of these packages were also sold at well below retail price on auction sites such as the then-popular QXL. As the call to activate the viewing card did not require any bank details, many ONdigital boxes which were technically on loan were at unverifiable addresses.