I'm from the UK and the main services like the Royal Mail and Parcel Force will advertise compensation up to £2,500, but when you read the small print, it states that they will only pay out compensation based on the price paid YOU have originally paid for the item.
Now if you have managed to buy a poster for a good price, and are able to sell it for a price that is ten times greater than the original cost to you. You probably won't be too happy about the amount of compensation you would potentially receive if this valuable poster was lost or stolen etc.
Does anyone know of a reasonable way to insure shipments that covers the cost of the sale price, not your cost price?