Depending on the size, it is really expensive.
I have been a shipping address for Triumphrat members in the past. They want to bid on a UK part, give my address as shipping, and then I ship it on (PayPal transfer when I know the actual shipping cost), but it isn't cheap.
What I tend to do is ask the buyer to get dimensions and weight and I'll find the cheapest quote from here, let them know and then they can make a decision.
More than once I have repacked to make the parcel smaller and save money (yes, I'm tight with other peoples cash as well as mine

)
If you want to try this, let me know
Rexx