You can always see about consignment sales at your local Tartan shop or buy the Argyll from ebay, you can find wonderful deals on the jackets either way.
Here is my Harris Tweed Argyll I was able to get it on consignment for $40.00


Here is my Burns Check Braemar jacket that I found on ebay for £20


So if you look around you can find things that are quality products at really great prices. It took me a year of looking but I found my Montrose Doublet in my size on ebay for £53. I even found a sgian dubh on ebay for $4.00 I used it until I could afford a better one, however I still keep the first one on hand in case someone needs one.