http://
www.ebay.com/ itm/6-scarlet-badis-/111973298391? hash=item1a1220f0d7:g:CA8AAOSw1DtXFU3W
it may be hard to get them sexed, they are almost always exclusively male when you purchase unsexed batches. I have 6 males, and I've been looking for females for them for about 8 months.
There are some sellers on ebay right now. Remove the spaces in the link above.