i don't do commissions or really do a lot with them, but i will. offer what i do know.

most jcink skinners who do commissions seem to be primarily on tumblr. from what i've seen, different skinners have different setups, much like artists who do commissions do. some simply sell skins that are already coded and some will do full skins from scratch and some will do things in between (like i've seen a few that will do like. main index + boards + info center for cheaper than doing that plus profile + mini-profile + thread list. or people who offer discounted skins that a small number of people can buy so as to bring the price down for an individual custom skin). again, as far as installation goes, it will vary based on the skinner's individual policies, but it seems to be... fairly common practice for them to pass along an xml file and provide limited support for installation (since while they don't necessarily want to leave someone floundering, they also understandably don't want to be committed to constantly fixing coding mistakes on a site they're not affiliated for an indefinite amount of time afterwards or have someone hitting them up every few months to ask how they did xyz thing).

if you're looking to find some, i'd probably start by just browsing "jcink skins" or "jcink skin commission" tags on tumblr and going from there (though i'd make sure to check to see that the skinner is still active before you dabble too much with them), and like i've been kind of saying, i'd make sure to closely read the skinner's individual rules and information to make sure it's going to work for what you want to (and so you can try to protect yourself from paying out to skinners who end up giving a half-finished product or no product at all).

i think the biggest thing i would warn for ahead of time is that, as you might imagine, a lot of skinners are primarily involved with the real life community - which means that while you can still commission them, you might want to make sure you're clear that you're in animanga from the start so you can make sure that things are being appropriately credited as well as see what they're willing to do in terms of graphics (since depending on what you're getting, they may not make the graphics for you for that skin).

like i said. i've never dabbled with it before and i'm not into commissions, but i know some things from seeing some of the commissioners talking about it on other resource sites (and from getting a lot of commission blogs recommended to me for a three month span), so uh. yeah.