They're very reasonably priced in the markets - around £8 for some really good 'designer' ones. Cheaper ones from £5-6. Around now is probably the best time to buy as in the summer they didn't have such a good selection. I got a beautiful heavy 'Kenzo' one that I could spend all day in.
Took some back for friends - who were highly delighted - they are better than any you can pick up here.