Where can i buy posters like these?

I have these two posters that are really nice,

I have a london one which looks like this..

http://www.europosters.eu/image/460/4590.jpg

and a new york one which is like this….

http://www.gbposters.com/image/image/3538/PH0291-NEW-YORK-taxi-no1.jpg

I want to but the paris one…..

http://www.allposters.co.uk/-sp/Paris-Posters_i4857872_.htm

and the venice one which looks like this…..

http://www.allposters.co.uk/-sp/Bridge-of-Sighs-Posters_i4916047_.htm

but i can’t find anywhere that sells them under £5 like my other two.
I don’t want to pay £8.99 like on the website,
so if anybody knows anywhere in the UK that sells them cheaper than that.
please let me know (:
Thankyou so much
Hx

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