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I would recommend the Mass Effect Poster Collection from Amazon, it's only 18 bucks. It comes with 20 posters on thick paper and has the same lithograph art that Bioware used to sell. These are amazing quality and are definitely worth it. :)
Here is the link. https://www.amazon.com/Mass-Effect-Poster-Collection-Various/dp/1616557427/ref=sr_1_1?ie=UTF8&qid=1478101264&sr=8-1&keywords=mass+effect+poster+collection
It is one of the posters in The Mass Effect Poster Collection. Unfortunately it looks like its not in print any more so its got high price mark ups.
Dark horse comics does such amazing merch
I got a ton of their mass effect stuff, even the mass effect poster collection and the posters are of extremely high quality, i recommed you buy some frames and hang them on the wall or buy a picture ledge shelf like i have
link to shelf
The mass effect poster collection has 42 posters that you can choose on. I don't know where you are in the word but here's the Amazon com link