Might be an idea to put a general location in your profile so that others can tell what country you live in and give you advice on suppliers etc.
In UK Octoink.co.uk can supply them.
If you give us more info, including printer type, if you want to use syringes or squeeze bottle etc. then I'm sure we can help you.
BTW, I've found it easy to dull a sharp needle with a fine file. I prefer blunt needles, but the sizes of blunts can be limited. Also agree with earlier post to "help us help you" by revising your profile with your location and refilling-related info.