i bought the multi pack in a zipper tin off 'ebay' for approx $18.
it's the best buy i've made in a while. i use them all of the time and love them! i use them for marking my fabrics for 'needle turn' projects and can't recommend them enough. you get such a lovely fine mark that makes your applique very accurate.
i wouldn't be without them now!!
bye bye chalk pencils!!!