Get yerselves down to the local car boot, there are loads of things you can get for less than a quid. Found a Joules fleece for 50p last week and huge Hosta's and Lupins being sold for the same. Some local allotment groups and farmers sell all their produce there dirt cheap too (you just have to wash your oddly shaped spuds and carrots rather than opening a plastic bag of prefect veg:-)
Think it's were all the Ponty girls go for their weekly shop.
Plenty of things still about for less than £1, you just have to shop around