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The Canon i560 is no longer manufactured. You can purchase a Canon i560 online from eBay for roughly $75-$100. Alternatively, you can find a newer model available from the Canon website.
The Canon BCI-3EBK works with the Canon i560/ Pixma iP3000/ iP4000/ iP5000/ MP750. It is a great cartridge for the money and offers an extended ink life.
Yes, you just have to install the drivers for the Canon i560 on your HP computer
Motorola no longer manufacturers the i560 but used and never before used phones can be purchased online at eBay and Amazon Marketplace through third party sellers. Sprint / Nextel stores may have trade-in phones that they sell but one would need to call each store to see what their policy is regarding selling refurbished phones.