This is what I found as options
Model Car World sells air brushable lacquers, and did have the slime lime you are looking for, I don't know what they called it, but an email to them could probably tell you if they still carry it, also there is a neon yellow listed under race cars which might work.
http://ourworld-top.cs.com/mcwautofinishes/
In spray cans
Testor's Model Master and their new automotive lacquer line apparently have some colors that could work for you depending on which shade of yellow / green you want.
Rustolium is the one that has in a spary can, apparently Key Lime is a close match for the greener trucks.
I don't know if you are looking for an exact match for a specific truck or not. Slime Lime or Slime Green as the color is popularly known, is not really a specific color. There are many variations based on truck manufacturer, date of delivery and the department. It varies from a bright yellow yellow to a very greenish yellow color. If you are not trying to make an exact match to a specific truck, you should be fine looking through the options I posted above and picking the one most appealing to you. You should be able to make minor adjustments by putting a coat of yellow or green underneath the top coats to shift the shade a bit.