You can find one on either eBay or amazon. They have small, independent sellers with a huge variety of Nintendo 64 games and accessories for really cheap prices.
The cheapest option is often the second hand or used games market. Many game stores have their own used game sales options. Alternatively try an online auction site such as ebay to try and locate a good deal.
One can purchase Nintendo DS games at local Gamestop stores. If not, local malls should have video game stores that would have Nintendo DS games in stock.
One can purchase bundles of Nintendo Entertainment Systems with games at your local games store. The Nintendo Wii is packed with Wii Sports Plus for free.
ebay
GameStop. Used ones are fairly cheap.
Unfortunately, it is not possible to obtain free Nintendo 3DS Games. However, Gamestop sells a variety of Nintendo 3DS games, and anybody can purchase them new or used. If purchased used, they are sold at a much cheaper price for a decent quality.
To enter EA games code for Nintendo Wii you may be required an additional purchase.
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Yes, there is 3D games available for purchase.
Unfortunately, the Wii will not play Super Nintendo cartridge games. However, through Nintendo's Virtual Console download service, it is possible to purchase a limited number of Super Nintendo games for download and use on the Nintendo Wii.
A variety of games are available to download online on the Nintendo DS website. If you do not have availability to the internet, visit a specialised gaming shop such as Game HMV or a commercial shop such as Tesco or Asda with a game section.