Lost ac adapter

Maybe a hardware store.

a zipper foot is 1/2 a full foot so if push comes to shove and a local sewing machine shop doesn't have a generic foot, simply get another full fut and hacksaw 1/2 off

Have you checked the website for this machine? They should be able to direct you to a replacement plate. I hope that this helps.

try this link for the part you need

http://www.sewingpartsonline.com/Janome-Memory-Craft-5700-sewing-machine-parts.aspx

Thesewingoutlet.com and bizrate.com both have them listed in stock, and you will probably find some on eBay as well. However, with purchase price plus shipping running around 40+ dollarsfor a machine that was only $55 new, you might be better off finding a new machine altogether that won't have any underlying issues that a used machine might.

try www.sewingpartsonline.com for replacement parts

http://www.sewingpartsonline.com/presser-foot-shank-elna-janome-kenmore-804509000.aspx looks like it is the one you need I think.

Try www.sewingpartsonline.com and put in Janome then your model number, they have all kinds of parts for sale. They may have your part or call Janome at 1-800-631-0183

There are several location where you can purchase a power cord for you machine, Here is an online source, Hope this helps
http://sewingpartsonline.com/power-cord-kenmore-385-12916-sewing-machine.aspx

Try this web site for sewing machine manuals http://sewing.about.com/od/beginner1/ig/Sewing-Tools/Sewing-Machine-Manuals.htm

Almost all of the Janome feet are interchangeable. Only a very few of their higher end electronic machines have special feet. So, if you ask for Janome feet, in general the stores give you the general purpose feet that work on most mechanical Janomes, such as Jem Gold, Decor, etc. Hope this helps!