I like my 301A and paid much more than you did. But she's sapphire blue.
The only foot I purchased was a quarter inch with guide. The quarter inch foot is a full 1/4" so if I start a project on the 301 I have to finish on her. I have heard that the walking foot doesn't work as it doesn't match up to the feed dogs on the 301A. Since all I do is piece on her, I don't have need for any other feet.