The following is based on selling it on amazon/ebay or the like within the US.
In the US, Wii Sports goes for $25 used, and Wii Play goes for $8. Wii Fit is still sold out in some parts of the US (but can be found online easily) and goes for ~$10 under new.
Both the rayman games will net $10 each.
Don't know why anyone would want to sell Galaxy as it is a great game.
You couldn't pay anyone to take boogie off your hands 
, but with a microphone it could net you up to $15.
Carnival games is insane and resells for over $20, Game Party ~$10, Mario Party ~$24, and Mario & Sonic ~$24.
So, grand total your game collection sold at the best you can expect in the US is ~$226 + Mario Galaxy which you shouldn't sell.
(source of info, just do a search for the other games)
http://www.videogamepricecharts.com/search?q=wii+sports&submit=Search
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