The MSP for Skye, Lochaber and Badenoch is backing a new campaign calling for fairer delivery charges to remote and rural communities.
With less than a month to go to Christmas, Kate Forbes MSP said it was "ridiculous" that parts of the Highland mainland are classified as "overseas" by some retailers.
A website has been launched here, where consumers who have been ripped off by extortionate delivery fees are encouraged to sign a petition as well as name and shame cowboy firms online.
It has already been reported that one company wanted to charge more than £40 extra for taking an item to the other side of the toll-free Skye Bridge.
The campaign is being led by Moray MSP Richard Lochhead, in a bid to stop rip-off parcel delivery charges that discriminate against homes and businesses in many parts of Scotland.
Kate Forbes MSP said: "In the run up to Christmas, we'll all be ordering parcels and we'll be again reminded of the injustice of paying more just because we live in the Highlands.
"It is ridiculous to pay more at all, when we know that Royal Mail delivers parcels to every corner of Scotland every day.
"However, it is doubly ridiculous that parts of the Highland mainland are classified overseas by some retailers.
"I fully support my colleague Richard Lochhead's campaign to name and shame retailers that don't give Highlanders a fair deal.
"I saw one comment on my Facebook page that suggested we have a list of retailers that offer a fair deal, and boycott the others that unjustly penalise Highland households."
Richard Lochhead MSP added: "As more people are shopping online, more people in rural Scotland are being ripped-off by delivery companies.
"I've been contacted by homes and businesses throughout the highlands that continue to be hit with these parcel delivery surcharges.
"These extortionate surcharges are costing people in Scotland millions of pounds that others don't have to pay and then retailers are saying that much of Scotland isn't part of 'mainland UK' to justify the rip-off – it's ridiculous.
"I've launched this campaign in response to this infuriating situation. There's no rhyme or reason to these charges and it's time we sort this out."