Heat shrink tubing - Large diameter

I'm in need of some clear heat shrink tubing (schrumpfschlach - I think) that's about 6 or 7cm in diameter and maybe 15cm long before shrinking. I tried Conrad's but all they've got is black that comes in a roll 35m long.

Any ideas? Thanks in advance.

Bauhaus on Landsbergerstrasse, near Donnersbergerbrücke - hard to miss.

Hi Hartnagel electronics or Rim electronics on Schillerstrasse have the shrumpf tubing. Failing them there are three more electronic shops on St Pauls street (as RIm is a corner shop it is also located on this street).
good luck