Linda, Hi! Here is one option that I've used once and was very surprised by: http://www.fullcompass.com/prod/131132-Roland-MOBILE-CUBE?utm_source=googleps&utm_medium=shopping&utm_campaign=googleps&st-t=googleshopping-musical_instruments&vt-k=&vt-mt=&vt-pti=131132&gclid=EAIaIQobChMIhMLT6bHY2AIVE7nACh2nmAQ0EAUYAiABEgLJwvD_BwE good luck, Paul W.