Hi there! Based on your request for the best prices on double door fridges, I'd suggest taking a look at the Samsung 470L Net Frost Free French Door Fridge in Gentle Black listed for R19999, or the slightly larger Samsung RF71A967535 713L French Door Refrigerator in White for R59999. Both of these Samsung fridges have plenty of room with their double doors and generous capacities. The Gentle Black model would add a nice sophisticated look to your kitchen for under R20k. Please let me know if you need any other details on these top-rated Samsung options!