For the "official" stuff:
The official dermapen is ~$400 for the personal (fixed needles - sold with 0.5mm but you can swap out to 1.5mm ($75 for 5)) and although prices aren't listed, I'm gussing ~$700 for the professional and ~$1000+ for the medical version.
The my-m http://bellaireindustry.com/my_m.html you can get the official version for around $450-$500.
The mesopen http://www.bellairei...om/mesopen.html - not sure on price.
The eclipse http://www.eclipsemicropen.com/ is around $3000 for a full medical starter kit with materials + needles and such.
Keep in mind disposable costs for the needles as well.
The you have the better quality knockoffs like:
Which IMO - I would rather pay extra for the "official" versions.
The cheap knockoffs, no idea - but I would be somewhat scared of blunt needles.
This thread might help as well :
Another option that can be looked into is a tattoo gun and doing "dry tattooing."
TCA you should be able to get here:
Scroll down for the higher concentrations. Ie I think :