If you are like me, you arrive in a new place & need to know where the local supermarkets are in order to "stock up"
In town there is a Sainsbury's at the Westgate Centre mall, and another on Magdalen Street between Debenhams and Borders
On Cowley Road you'll find a Tesco, and another on the ring road where it crosses Cowley Junction near the car Factory, this one is much larger.
Also on the ring road is a large Sainsbury's at Heyford Hill - the point beyond where Rose Hill meets the ringroad, and if you want Asda then you have to brave the little country roads to & through Wheatley to find it.
What to buy: Food & Drink (mainly)