http://www.jorosports.com/
I used this site to purchase mini-helmets for the 12-Team Local I run a few years ago...
...the results were...FANTASTIC!!!
A little pricey for some, I'm sure, but this is a 'high-stakes' Local ($550 Entry Fee), with some pretty demanding Owners, and not one had an issue with the finished product.
The Owner of this Company is John Wolfe. Both his email and the Company Phone # are available on the Site. He's a great guy, and VERY willing to work with folks on getting the details worked out to produce some very high quality results.
I worked with John over the course of about 2 Weeks, a half-dozen phone calls, and about the same amount of emails...
The helmets are authentic Ridell replicas (complete with the 'warning sticker' on the back), along with chinstraps. First order of business was establishing the base color for the helmet, and facemask, for each team. After I gave him the nicknames for each team, he sent me several logos to choose from for each helmet - his library of these is quite deep, and there was the option of sending him artwork as well. Didn't need to do that, as for each team he came up with several more than acceptable alternatives.
Well worth it, if you, and your League-mates are interested in having individualized mini helmets for each team.
Highly recommended!!!