Does the Humane society sell pet products and food to the general public?

I think so but u could always call

Where can I drop off six stray kittens?

They have basic pet items for sale and all money made goes to the facility.

Yes, call, email, or ask in person as to what products they have available.

Yes

Yes they do...Call them and see what they have

Yes they do in multiple buildings

Yes they do they have limited space so send an email and they will let you know what they have compared to what you need