Where can i get cheap diy hair extensions on the high street??

I am going to a fancy dress party dressed as dorothy(wizard of oz) and i need to have sexy plaits. the thing is, my hair is only past shoulder length and is fine on the ends. does someone know where i can get some kind of extension/decent wig where i can weave it into my own hair. i only need it temporary bloke y thanks i am in telford, shrops, uk
Answer
Try ebay