i got this m3 tape off of ebay,found it on an earlier thread on the forum-
http://www.ebay.com/itm/BMW-M-TRI-CO...00861377130%26
it works well,quite a bit cheaper thatn the bimmian stuff.it's not pre cut,though,comes in 1" wide strips,so you have to measure,then cut with a ruler and razor blade.the good thing is,there's enough left to do it a few more times if the stuff on there wears out.