Not a huge sale but some like Valvoline a lot and I'd buy both the syn blend 5w-30 and conventional 10w-40 for 16.99. Many blue bottle quarts up to 20w-50 and both detergent and non detergent sae 30 are 3.49.
https://www.napaonline.com/en/search?text=NAPA+Motor+oil+5+qt+&referer=v2&page=2
https://www.napaonline.com/en/search?text=NAPA+Motor+oil+5+qt+&referer=v2&page=2