I don't know anything about the A3000 so can't help you there. I did recently get an as new condition Ricoh KR-10x with K mount which I am very pleased with.

Although the Ricoh can be used in manual, I will probably use it on aperture priority when I am out with a camera but not out for the purpose of photography.

When I'm pretending to be a photographer, I try to use one of my manual only cameras. There is room for both types and there's nothing wrong with using automatic modes - especially in non-challenging lighting conditions.

If you can afford it, $20 isn't much to pay for it so why not? If you're only going to get one though, the Ricoh might be a better choice.