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I found a lovely site that allows you to print paper models of many different landmarks, vehicles, people and many other things for free. Yes, it's absolutely free. They are quite easy to make. You just need to print them out on paper and if you want a bigger version of the models, just bring it to a photocopy shop and have it enlarged!
No need to spend money buying those paper models selling in bookshops! Check it out. I love it. www.papertoys.com