Hello, Sheryl -
The answer to your question will depend upon the country where you reside. I have no idea what country that is. I am answering from the USA.
If you are in the USA, you can find needles for Janome sewing machines here:
SewingPartsOnline.com
(TinyURL link)
https://tinyurl.com/yb5o7r45
You can use your favorite search engine (Google, Bing, Yahoo, Duck Duck Go, etc.) to find other sewing supplies web sites which sell needles for Janome sewing machines by using the following search phrase, with quotation marks as shown:
Janome "sewing machine" needles
Websites which sell in the country where you reside should be the top search results.
Best wishes.