First of all, you need to post a certain amount before you can receive PMs. I believe it is 5, but I'm not sure exactly.
You can request a pm from this guy. You get two 5ml bottles of your choice.
http://www.e-cigarette-forum.com/fo...-liquid-samples-first-timers.html#post7128524
Other than that I'm not sure of any really "Free" samples. Honestly, I'd say just search the forum.
I mean you CAN find free samples online all over the place but most over charge for shipping to make up for the "free" e juice.
As a matter of fact, I've found plenty of free samples online. But all require payment for shipping.
The only time I've never had to pay for e-juice is when I traded a device for some. A lot of juice actually.
If you have any devices you don't use you can put them up on the PIF thread.
http://www.e-cigarette-forum.com/fo...-please-read-first-post-rules-guidelines.html
You can also find really cheap e-juice on the deals and steals thread.
http://www.e-cigarette-forum.com/forum/pay-forward-pif/418767-deals-steals-234.html
Also the post by stevegmu reminded me the if you live close to any vape shop they usually let you try out the juice before you buy it.
This doesn't mean you get to take free juice home. But the store I go to locally has every juice they make in test tanks on a table in the middle of the store. This way, I can sit and take an hour tasting all their juices and then decide which I want to buy.