http://www.paris-travel-guide.info/eiffel-tower-posters/
where could i find a Paris Je’taime movie poster?
preferrably the poster with the red heart made of eiffel towers
This site has links to a number of sites that sell movie posters. http://www.impawards.com/2006/paris_je_taime.html
If you live in a big city, you could also try checking with a local art house theatre to see if they might have one they would be willing to sell you.
Aside from that, try eBay.
EIFFEL TOWER, PARIS – VICTORY IN EUROPE TOUR 2010