Buying a West Highland terrier costs between $900.00 to $1,200.00 and then you add in the cost to take care of the West Highland terrier which can cost from $900.00 to $1,000.00 per year for food and then maybe a bit more when you add in vet visits.
Some pet adoption centers have some West Highland terriers that you can usually adopt for a small adoption fee which would be a better option and cheaper than paying a high cost to purchase the West Highland terrier.