Hi Sweetpeach,
I'm going to throw out loads of ideas, just in case you haven't tried these places. Bearing in mind that we have a family of four and we live in Huntington, nr. Monks Cross.
The car boot sales at Murton Farm Park and Wigginton are great. I have bought books, plants, fruit and veg, toys, bikes etc.
Ebay for clothes and toys has helped us a lot.
Wilkinsons is definitely worth checking out every couple of months to stock up on toiletries. Also if you are there in Clifton Moor, try Poundstretcher, Nettos (quality sometimes a bit shaky) and Home Bargains.
I don't live far from Monks Cross, so I do my weekly shop at Aldi and Sainsbury. I absolutely love Aldi and it has saved me a lot of money. My children love fruit and veg and so I follow their super six and plan meals accordingly. This week they had pineapples, bag of apples, bag of potatoes, punnets of grapes, punnets of plums, etc for 59 pence each. The quality has been very good, but unless eaten in 3-4 days the fruit will go off. Aldi also has sirloin steaks for 3 pounds and packs of frozen salmon fillets for 2.49. We don't care for their coffee or their ground beef. Their cold cuts are very good quality and we have been pleased with their cheeses as well. I highly recommend The rest of what I buy is generally Sainsburys basic range. I avoid the big Asda and Tesco as I always end up spending way too much there.