First off, welcome to the Guild Gatekeeper. Second, allow me to elaborate on the point made by Max. The images of maps that you have linked to are of a professional, commercial quality. There are many professional, armature and novice level cartographers here who use these forums to look for map commissions. Some of the latter may be willing to take on a commission, such as yours, for little to no pay as a way of refining their skills and building their portfolio. However the end product of such work will in general be nowhere near the level of quality demonstrated in the images you've linked to. If you wish to attract professional cartographers to do quality work for your novel then your commission rate will need to reflect that. Currently it does not. Not by a long-shot.
In addition, your schedule is a bit demanding. Three maps in 60 days is doable, but it's tight, and many artists/cartographers would either reduce the detail/quality of the art or require additional compensation in order to do quality work in that short of a time-frame. Further, given your coprright restrictions, most cartographers will require additional compensation since this will be the only opportunity for them to profit from it commercially.
Rates vary widely from artist to artist and depending upon the nature of the project. I can tell you that I personally wouldn't even consider taking a project like this on for anything under $750 (and it wouldn't become attractive to me till the commission rate cleared a grand). I suggest that you take the time to read through
this guide. It does a very nice job of breaking down what realistic expectations are for publishers/novelists looking to commission artwork. I wish you all the best in your endeavor.
Cheers,
-Arsheesh