I've never looked into getting one installed myself, but it should be pretty basic so I agree that $2k seems really high. Are they having to run a bunch of new plumbing or electrical to add it into your system?
Unless you want to put it in a really odd location or there is a huge plumbing issue that is at least double what it should cost. I can install one in a basement in 2-3 hours plus plumbing materials that wouldn't run more then $200.
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Hooking up the water isn't the hard part (Pex pipe, pex tool, some fittings, and a drill are about all you need) but running the drain is a little bit more work. The drain line needs to be run at a grade (typically .25" per foot) and will need a trap. Also, tapping into existing drains can be easy (ABS/PVC drain pipes) or hard (cast-iron/galvanized piping).
$2000 is quite high - I would shop around. Since Lowes just contracts a plumber to do the job, you should be able to save quite a bit by cutting out the middle-man. I would get estimates from a couple plumbers at least before you try it yourself - while it certainly isn't impossible for your average DIYer to do, it can be tricky. If your existing plumbing is old there are likely going to be some issues connecting to it without any leaks.
I worked as a plumber for 5 years (one year of actual apprenticeship school) before going back to school to become a teacher, so I've seen a lot of cases where as you cut into existing lines stuff starts leaking, so be prepared if you decide to do it yourself.
