Well, how about saving the planet? Actually, solar panels are initially expensive, but they are becoming more and more effective in electricity production for the size of the panel. You can generate enough free electricity for your own use, and sometimes sell back to the national grid any excess electricity you produce. Most installations are moveable to a new location should you move house or business address. You can get tax rebates on the cost of the installation. A battery will store the electicity for your use at a later time.
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Buy a good calculator.
One can buy a (1) 800 number easily from the website 800. It is a very well known and reputed company and has been reviewed to be very good by it's customers.
I see no reason why they would do that. Prime numbers can be used for encryption, but there are algorithms that can quickly generate a more or less random prime number. No need to pay for the "discovery" of a specific number!
Yes you can buy a graphing calculator. I know they are sold at places like Walmart, and Target and most of them are around $100 but go on sale before school starts for around $90. TI-83 and TI-84 graphing calculators are really good.
There are many websites that offer these as products. A few good options would be the GlassTilesStore website, the MosaicTileSupplies website, and the CoolTiles website.