I’ve bought a few bits from there and various other places in Japan
it’s normally about 20-22.5 percent of your total order including postage. Just depends on who is actually delivering it once it hits UK shores,
For example, I know ParcelForce UK add a £12 Admin/Handling fee per delivery from Japan. I think DHL where about £7 for the same. So obviously depending on the value of your order this may be a big or a small percentage of that value. This Admin/Handling fee has nothing to do with the customs or import tax fees that are also there to pay
like I say I normally add approx 22 percent on to my total with whoever I’ve ordered with and I’m never too far off with my guesstimation.
I know it’s not exact but hope it helps mate