Allo all, will hopefully have more luck here than with my last question. :)

I've been asked to set up a shop such that the shipping is per-item, but with bands per item ... so shipping 1-4 widgets would cost £2 each, 5-9 £1.50 each, 10+ £1 each, etc. And shipping widgetTwos would cost £3 for 1-4, etc. I'm presuming this would require a mod, but what'd be the best approach? Use the weight, and multiply that by a factor per band, perhaps?

Many thanks for reading :)