I'll second the Mitsubishi, likely the best on the market, but very far from the cheapest. Any HVAC wholesaler will have them, WWG, Sinclair, RSL, Ecco, Emco, Lennox, etc, but not all will sell to the general public, and also don't expect wholesale pricing.
As far as a DIY project, I would actually say yes, if you are very mechanically inclined, and follow the instructions and manual very closely. However, there is specialty equipment needed for a proper install, such as refrigeration gauges as well as a vacuum pump, nitrogen tank and regulator, as well as a flaring kit for your linesets. The cost of this equipment will very likely exceed anything you might save by doing your own install
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