Here is the rarity list:
http://antseezee.sph...arityguide.html
There you go for a list of NES games and their rarity. As for the NWC cart, another person explained, but I will elaborate as much as possible. There was a Nintendo Championship back in the day and players would go up on stage to compete, and as the above person said Grey and Gold carts were given out, 26 Gold and the rest were Grey, out of 90(you do the math, I am tired

)Anywho, the games on these carts were Super Mario Bros., Rad Racer, and Tetris. The player would have to collect 50 coins in Mario, race quickly through a level of Rad Racer, and then play Tetris until time ran out. Then the scores were added up. Grey carts are slighty less pricey than the Gold carts, but can still go over 1000$. And as I stated eariler, the Gold carts can go for 5000$ and up!
Aladdin games eh? They can command a bit of money, but of course are totally useless without the adaptor. Aladdin games go for anywhere from 30$-80$, as I have seen, but, there is still an independent seller selling the adaptor, and all the games factory sealed for 85$. But the site eludes me, I am sorry, mainly because I would like a set! Finding them in the wild is slightly more harder, due to the late release of the adaptor and games, and they were released in limited quanities.
Thanks for your time in reading this, and I hope I helped!