I am SO grateful to all of you for your great advice! I have been glued to Craigslist looking for one of the 3/4 Kenmores with the rose case, but haven't found one. I might bid on the one on ShopGoodwill, but the only time I bought a machine from them, it arrived in pieces because they shipped it in the case. Also haven't found a 301, 401, 403, etc.
What I did find, which was initially very exciting, is a Kenmore 158.17741. It has all the accessories, manual, is relatively light, looked perfect, etc. My granddaughter was visiting and was so excited about the different stitches. I oiled everyplace it showed in the manual and it seemed to run great. THEN, we tried to reverse it and first it wouldn't reverse and then it would ONLY sew in reverse. I opened the top again and played with different parts and everything seemed to move freely when I moved it by hand. I think I'll start another thread with all the details. I doubt that I can fix it in time for her birthday unless the fix is simpler than I think.
So, the current plan is that I'm cleaning up a Kenmore 158.13033 that I had gotten a few months ago. It had Sharpie marker all over it, which I've mostly gotten off, although not completely. (Any suggestions for Sharpie removal?) It works great, but it's much heavier and doesn't take cams or have any extras. Meanwhile, if something spectacular shows up on Craigslist between now and Monday, plans could change! And I have five younger granddaughters, so I'm going to keep my eyes open for those rose cased Kenmores.
Thanks again for all your help!