Apart from using Media.io to generate instrumentals from music, you can also directly download instrumentals files online from some websites that allow you to access thousands of viral royalty-free instrumentals and vocal sounds, like Splice.com, Noiiz.com, Landr.com, etc.
However, most websites are not free. There is a price to pay, so, the most cost-effective option to access instrumentals you like could be Media.io online instrumental maker. It doesn't cost you a penny to use.