I also pay attention to what's available and ready to ship. Otherwise, you end up waiting as their estimated 'in stock' dates seem to slip endlessly.
If possible, don't choose Singapore Post. They seem to take FOREVER and once it finally is marked as on it;s way to the US, there is no further tracking of the package.
Really gotta watch what you buy. READ THE REVIEWS and search the forums... Some things are a good value, some things are about as cheaply made as is possible. For example, their GP Paps mod is a POS compared to the Desire-ecig version. Desires version is extremely well made and is my favorite mech mod. Copper posts and button, very nicely done SS tube and rings. Fasttechs version uses brass and is just vastly lower quality. Same goes for a lot of the RDA Clones... I mean really... if you are paying $7 for something, expect $7 worth of quality...
On the other hand, Fasttechs version of the Taifun GT & GS is very well made and is my favorite tank. Again, read the forums to make sure you order the correct version as they have 2.
I've come to rely on Fasttech for the small things like tools, empty bottles, RDA stands, etc... great value if you can stand the wait.
For me, my wait times generally run about 3 weeks which is fine for what I buy.
Out of 5 orders, I've had 2 items come in defective. A GP Paps that was missing the bottom insulator and difficult to thread top cap and a Kayfun that had a stripped positive post screw... I'm in the process of getting a refund for the GP Paps and a replacement for the Kayfun...
C