http://www.melissaprimm.com/island-for-sale-magazines/

Having trouble deciding my yard sale prices?
Okay so were going to have a yard sale soon and I’m starting to find these things that i want to sell but I’m not sure how much money I can make on these items. Any Ideas?
*Pokemon Diamond
*Pokemon Pearl
*Gameboy Advance SP (carrying case and charger included)
*Gameboy Advance (back cap missing)
*Pokemon Saphire
*Pokemon Emerald
*Pokemon FireRed
*Yoshi’s Island for game boy advance
* Nintendo GameCube with 1 control (or more)
*MarioKart Wii Game Magazine
*Nintendo GameCube Games
Go on eBay and look through **Completed** listings to see what similar items have sold for – don’t bother looking through active listings, as they won’t tell the story you want.
If you’re planning on buying a Wii, you may want to keep the GameCube controller.
You can probably sell Emerald for more than Sapphire or FireRed, even though they’re from the same generation – Emerald had an item dupe glitch that obsessive Pokemon players can exploit, making it the most desirable Pokemon game from that generation – you can import the duped items into your Diamond/Pearl game, too. You can probably get $25-30 for the GBA games (20 for Yoshi’s Island), and $30-35 for Diamond and Pearl (those are about what you’d pay for them used at any GameStop or other used game shop. But since it’s a yard sale, you might want to haggle down.
For Sale By Owner Magazine