<p>After doing a lot of research, I've decided I want to purchase a Creality CR-10S as my first 3D printer. I'm trying to locate a reputable, local seller. Other than Amazon, which seems to have a bit of a mark-up on price, I'm finding several websites that seem to be located outside of the US. Can anyone direct me to a seller located in the US?</p>

I am afraid unless you are available to accept the mark-up, you won't find a
reputable seller
other than in mainland China.  The entire business model of Creality is "cheap-cheap-cheap B2C" and any step you add to the supply chain (like a reseller) will be:
An added cost
that will be reflected on the final price you pay
A reseller-based initiative
, meaning that it won't be part of a "creality global distribution network", but the project of that local entreprenour.
That said, I read in a couple of places that
tiny machines
(Houston, Texas)
does a good job by testing each unit prior to shipping, and has similar lead times than good sellers from China (a couple of weeks).
Please note I am not affiliated with them in any way.  For that matters, I don't even leave in North America nor have purchased anything from them.