If money is no object and are items still available, your local Suzuki dealer parts is the best bet. I'd hazard a guess at £30-£50 a pop?
Or, look on Ebay (worldwide search) like here:
http://www.ebay.co.uk/itm/181942104785
Alternatively, you could use one of the many vinyl decal firms, many on Ebay and specify the dimensions (you could ask a Samurai member here).
I've had good results if you email them a pic, they can match fonts very accurately these days. Look to pay between £5-£8 each.
As a former custom MTB builder, I've also used an English guy living in France now who does good work, here's his website:
http://www.wanit.co.uk/contents/en-uk/d1.html
He made up an LJ 80 decal for me from a pic I sent.
Good Luck!