But as others have mentioned, commercial printers are really cheap, especially for how complicated they are to replicate so there's not much motivation to make them.
>>ent+(OP)
The printers are cheap (if you also need a scanner price is going up a little). The ink isn't cheap though, its artificially high, and all the major printer manufacturers actively hamper your ability to go for a non-branded ink version. Cause that is where their profit margins lie.