Customers in the north of Scotland have been found to pay up to four times as much for parcel deliveries compared to the rest of the UK.
But the research from Citizens Advice Scotland (CAS) has discovered that excess delivery charges can affect anyone ordering goods north of the central belt.
Yesterday the organisation called on couriers to consider working together to reduce their operating costs so the savings can be passed on to customers.
And today, Moray MSP Richard Lochhead is leading a debate in the Scottish Parliament about the issue.
CAS consumer spokeswoman Nina Ballantyne said: “Delivery charges should be up front and justifiable, and we would like to see consistent pricing policies across the UK.
“We are committed to finding solutions for consumers and are working with delivery companies and consumer groups to reduce costs and improve transparency.
“We hope to be able to identify suitable trial projects in the coming year in partnership with the Scottish Government, local authorities and communities.”
Research done by CAS concluded that north and north-east customers pay, on average, at least 30% more than the rest of the UK. However, that figure can rise to 50% on the islands.
Small parcels are subject to a 13% rise compared to cities in the south but the heaviest parcels can cost up to four times as much.
The research examined differences between online sales to 12 different addresses that were spread across the UK.
More than 1,500 people have now signed Mr Lochhead’s “fair delivery charges” campaign to share stories about rip-off fees.
He said: “It’s ludicrous that online shoppers in the Highlands and islands can be expected to be almost four times as much – purely because of where they live.
“I welcome these findings, which are consistent with the shocking stories I’ve been hearing as part of my own campaign.
“There should be set standards retailers should be forced to adopt for deliveries across the country.”
Mrs Ballantyne added: “This new data is stark. It’s not just a problem for remote and rural areas. It also includes Aberdeen, Aberdeenshire, Moray as well as the Highlands and islands.”