I wasn't impressed very much with the higher prices the SID gets when going to look over a number of VV/VW devices. So far I kind of have a liking for the Eleaf iStick despite not having separate wattage and voltage modes but displays both at the same time only changing which is the largest on the display.
The SID is more or less a different model name offering an 18350 battery tube you can use on the Smok ACE aluminum body version since that comes without the shorter battery tube. The gold color is also a bit off from the gold on the ACE as well that's priced about $35- on average unless you find a deal like the much lower price found for $30.90 compared the $48 seen at the vendor you posted. Dude. Smoktech SID
Even Newegg has started carrying ecigs as well as coffee urns and other diversities when browsing the catagories there. The Smoktech SID Kit
was priced at $29.99 there. That's from having a market place available where other vendors sell through them. Here I spent more time browsing and price shopping the entire "Bing" web for more specific items in order to save $$$ for others at times as well as for my own use.
(Of course that's a way to have your head handed to you if you should something cheaper that a reviewer tags since they get paid by certain vendors for the reviews!
Now if you have a specific price range I can generally point out some of the better deals once I have a specific item. For the basic starters kits while most places want upto $50 or more for the double battery eGo CE5 1100mah kits those are available for $19.95 at one NY vendor. A single battery with clearomizer and usb adapter I mentioned before on the thread is only $8. For different mods and variable batteries it seems for each one you need to find a different vendor in order to get the best price.