The BHS has more arrangements available than at the above link, but if you click on the link you will find music that is cleared for use/sale in the UK, thus avoiding some heartache. If you are looking for arrangements for women's voices, you can click on the filter option 'SSAA/Women', however that will bring back all arrangements - make sure you check the territory they can sell to, click on the 'Additional Info' tab and scroll to the bottom for territories.
Increasingly, barbershop arrangers are self-publishing their arrangements using the "ArrangeMe" programme on sheetmusicplus.com as a way of getting around the hassle of procuring permissions and licence to distribute. It's always worth a look, especially if you are looking for a specific song title or arranger to narrow down the search.
LABBS publishes recent polecats arranged by the LABBS Music Category Judges via sheetmusicplus, at the following link:
Published by LABBS on SMP
BHS has some free songs and tags available for download, including a few in women's voicing. They are able to be free as they are songs in the public domain*, so older.
Harmony Inc has some free music arranged for women's voicing for public access download - don't be put off by the words in the link! They are able to be free as they are songs in the public domain*, so older.
* Note: The legal definition of when something becomes public domain is different in the USA to the UK. If you do not know the difference and wish to perform one of these songs, always check first.