Just to mention I took a chance on buying some bulk tapes from a company called tapeline based near me (well, in Stockport) at rock bottom prices, 30p each for normal C90's and 42p for C90 Chrome - they can supply labels too for a printer so your tapes look nice, anyway, point is that the quality is good and they will make them to practically any length you like and have various shell colours.
I bought 80 odd, but Im sure smaller orders wouldnt be an issue.