i'm gonna be making a couple of holes in my motherboard tray this weekend in order to do some decent cable managment. i've been advised to get a bit of rubber edge molding to cover round the holes to protect the cables, this can be had cheaply enough online, approx £1 per metre, however any sites i've found charge around 5 quid just to post a couple of metres of it standard royal mail
my principles/miserableness are telling me not to be held to ransom, so is there anything else i could use, maybe some duct tape or insulating tape to cover the edges maybe?
any thoughts?

any thoughts?