I don't know how trustworthy any of these sites are, I just googled.

http://www.redbubble.com/people/thewintercold/works/9118771-fate-stay-night-iphone-cover?p=iphone-case

http://www.coolstylecase.com/iphone6plus-S2031-fate-stay-night-archer-tohsaka-rin-unlimited-blade-works-mobile-phone-case.html

http://www.coolstylecase.com/iphone6plus-S2032-fate-stay-night-tohsaka-rin-mobile-phone-case.html

http://www.coolstylecase.com/iphone6plus-S2033-fate-stay-night-matou-sakura-mobile-phone-case.html

http://x00l.com/shop/fate-stay-night-cartoon-anime-black-phone-case-for-iphone-6/

http://www.amazon.com/S0617-Night-Command-Spells-IPHONE/dp/B00NZ4DCVC

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http://www.amazon.com/S0616-Night-Excalibur-Cover-IPHONE/dp/B00NZ4DBF4

http://www.coolstylecase.com/iphone6plus-S2033-fate-stay-night-matou-sakura-mobile-phone-case.html

http://www.coolstylecase.com/iphone6plus-S2035-fate-stay-night-saber-arturia-pendragon-mobile-phone-case.html

http://www.amazon.com/Night-Excalibur-Plastic-Compatible-iPhone/dp/B00O7PQ1J8