There were queues at some of Comet's 236 stores today (November 8) as the sale started at 9am.
But some customers were left unimpressed with the 10% or 20% discounts being offered on goods, and left empty-handed.
Comet is not offering the sale online, but did say that gift vouchers would be accepted on items, following their temporary suspension over the weekend.
However, it warned customers that no refunds will be given on items purchased, and any products ordered before the firm went into administration last week but not paid for would not be delivered.
Anyone who paid by credit card for an order that is not delivered by Comet may be eligible for a refund from their provider.
On November 2, Comet appointed Deloitte as administrators of the business, and the accountancy firm is currently winding down the operation, putting 6,600 jobs at risk.
Dixons, the owner of Currys and PC World, has postponed hiring 3,000 staff for Christmas so that Comet employees can apply.
Deloitte is still trying to find a buyer for Comet, but stores will reportedly start to close next week, potentially including the just two-year-old Lakeside outlet.
The fortunes of Comet appear bleak as OpCapita, the venture capital firm that managed to save the GAME retail business earlier this year, was unable to achieve a similar feat with Comet.
OpCapita acquired Comet for just £2 from Darty (then known as Kesa Electricals) in February this year. Darty paid OpCapita a £50 million dowry to take on the loss-making business, which is estimated to have a 6% share of the UK electricals market.
However, Comet is understood to have hit problems in negotiations with suppliers ahead of the peak Christmas period. This is because it is trading without credit insurance, which protects the suppliers, and so has had to pay for the goods upfront.
If it does collapse, then Comet would become the biggest UK high street name to fall since Woolworths in 2008.