I got a new one with box and instruction, complete. A gold GBL.
Are they worth the price?
No. It's a nice collectors item, if complete and in mint condition, but not more.
I recently bought a GBC with a front-light mod and I really don't like it. The contrast is terrible, and I can't handle the added glare from the grooves in the light panel...
Then don't go for a GBL. Even with the Backlit tuned on, the contrast is still not good. In my childhood, i would have chopped my left arm off for a Game Boy with an internal light. But compared to that what we have and know today, it's terrible.
As much as i know, there is now "offical" way to really play Game Boy B/W games with comfort and enjoyable.
Original Game Boy - No light, bad contrast
Game Boy Pocket - No light, a bit better contrast
GBC - No light
GBL - Terrible light, bad contrast
GBA - No light, good contrast
GBA SP - Good light, good contrast, but no original screen size and feeling
I also got an GBA with an GBA SP Backlit built in, thats the best way to play B/W games. Or i use an Game Boy Pocket and place myself under a good light source.
Of course, Emulation is an other thing...