I've written about the VPN Unlimited service before, you should go read the review. 

If you check out the VPN Unlimited purchase page, you will see that they are running a promo and selling it for $149.99. Normally StackSocial sells this same plan for $49.99 but wait ...

They are currently running a promo and have marked it down to $29.99, but wait ...

If you add it to your cart and use the code CYBER40 at checkout, the price drops to $18.

I don't know how long the CYBER40 promo code will work so if you are interested, buy it soon.

Special discount page: link