I keep losing and swapping the single flange tips and I'm running out. Where can you get a big pack of them??
what IEMs do you have? you can try the sony hybrids or get some from companies like Comply.
http://www.complyfoam.com/categories/Brand/Thinksound%E2%84%A2/ pick your poison.
Or can go to on ebay to see if anyone is selling OEM tips for your IEMs.