I bought this light tent from Yahoo Auction for S$30.

Here's what you get in a black package (compared with AA battery)

Here's what you get when it 'pop' out of the bag. (compared with 30cm ruler)

There is a blue backdrop that comes with the Light Tent.

But I use paper as backdrop instead because of the crease lines. I tried ironing the blue cloth.. but can't remove the crease lines.

My usual normal setup. The Light Tent comes with a front flap to put the lens through and prevent external lights from interfering with the light condition inside the tent.

Is it worth S$30?

Yes, it does when you compare the prices for similar products.