I haven't seen ERA around here for awhile, but I saw several on contract for firefighting in 2000-2002. I even got to fly in an ERA Bell 212 on contract with the BLM in Bakersfield, CA. I don't know what you guys are flying now, but I saw a couple 212s and a Puma or Super Puma.
In 1/72
Italeri has done a Puma, there is also a Super Puma (from Heller?)
Italeri has a 212 and 412
I see PHI all the time, they have two Med-evac helos that unfortuately are frequent visitors to us. They have an EC-135 and AS-350B3. Revell does an EC-135 in 1/72 and 1/32, Heller does a 1/48 AS-350 A-star.
Here is a link to Belcher Bits 1/48 Bell 412 conversion
http://www.belcherbits.com/lines/148conv/bb8.htm