Hey there, you can do it yourself using free software like paint.net. Just remember that when you scale it you have to use "nearest neighbour" scaling and always to scale by X*100%. :)
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Paint.net is free to use, if you are paying for it then someone is ripping you off. https://www.getpaint.net
I am unsure what you mean in regards to the resolution. What are you working in/with for the game?