Adorama offers the 2nd-gen Focusrite Scarlett 18i20 USB Audio Interface, model no. SCARLETT18I202NDGE, for $369.99 with free shipping. That's the lowest total price we could find by $130. It features 18 inputs, 20 outputs, digital conversion up to 24bit/192kHz, ADAT expansion ports, two headphone outputs with dedicated volume controls, and is compatible with Windows and Mac digital audio workstation software.
There are many ways for seniors to get cheap -- and even free -- entertainment and services.