You can poke around webstores like Rhode Island Wire, Terminal Supply, etc.
What I did was download a Tyco (TE) AMP catalog of open barrel ring terminals.
narrowed down the type and style and ordered the p/n from one of the supply houses (Mouser, Newark, etc)
Dont remember the URL,
Some of the ones I bought were pretty thick and much more difficult to crimp with the crimpers I had available.