UltiMaker uses functional, analytical and tracking cookies. Tracking cookies enhance your experience on our website and may also collect your personal data outside of Ultimaker websites. If you agree with the use of tracking cookies, click “I agree, continue browsing”. You can withdraw your consent at any time. If you do not consent with the use of tracking cookies, click “Refuse”. You can find more information about cookies on our Privacy and Cookie Policy page.
I've used Aluminyze before and they do great metal prints, not sure if they still do 30x40 but you can check on their site. They also give discounts/sample packs if you contact them so maybe give them a call. Hope that helps.