They've always been on the expensive side for good examples due to fragile or yellowing bubbles on moc and paint chips/missing parts on loose.
Here's a great site by Spoons on die cast if you're looking for some variations too: http://www.vintagestarwarsdiecast.co.uk/featured-articles
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Paul F,
thevintagetoyadvertiser.org 1970s and 80s vintage toy ads and other retro paperworks
imperialgunnery.com Vintage Star Wars action figure weapons and accessories guide