Best heated hair rollers?

My mum wants some for christmas so i wanted to ask which are the best for under 25 pounds? Her hair is quite thin and goes down to her sholders maybe slightly longer i was looking on argos this is the link ... a href="http://www.argos.co.uk/static/Browse/ID72/23719068/c_1/1|category_root|Health+and+personal+care|14418350/c_2/2|14418350|Hair+care|14418399/c_3/3|cat_14418399|Hair+rollers|23719068.htm" rel="nofollow"http://www.argos.co.uk/static/Browse/ID7…/a