The T-Shirts were given as a gift for a $20 USD donation during WCG and this is probably the price they will remain on, plus the transportation cost. They're all in very good quality, both the T-Shirt and the actual printing, and thereof the price.
The reason why you did not see a drone was because the drone actually requires four colours instead of two (as the Probe and the SCV does). This means that the drone unfortunately will be a bit more expensive than the others. Zergs might not be known for a good economy but we're sure they can spare some for this one.
We bought 60 for WCG and sold most of them, I have a couple of them with me home though. We will give you more information as soon as we agree with an interested seller for GosuGamers. Until then, please do not ask us when they will be ready. Time will tell!
For those of you who do not know who Miss Choy is, she is the regional manager of ICM. ICM is the organization who coordinates all the strategic partners, the sponsors and organizes WCG. I believe they are now a subsidiary of Samsung Corp.