The kit, which retails for $30 at r2fishschool.com, comes with a 45-minute DVD, a training manual, a feeding wand and more than 20 accessories.
教具套装在R2金鱼培训学校"的网站上零售价是30美元，包括一张长达45分钟的DVD，一本训练手册，一根鱼食棒和20多件小工具。
A Samsung Galaxy S II retails for $499.99, but costs $199.99 when purchased with a two-year contract on the Sprint web site.
比如说一款售价499.99美元的三星Galaxy S II 在与Sprint签订2年的使用协议之后就可以降到199.99美元。
Among them is Sega Toys in Japan, which makes Brain Trainer, a portable electronic device with various mind-expanding exercises that retails for about $30.
日本的Sega Toys就是一间这样的公司。 它的产品是一种叫做“思维训练师”的便携式电子产品，有各种各样的开拓思维的训练功能，零售价格是30美元。
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