Do new automobiles typically release in low numbers?
and later you say
The car released 2 days ago. I called around and discovered local dealers only have ~10 2018's total for all trims.
So you are calling local dealers and they have ten after two days. Let's say you are in New York City, population eight million (about 2.5% of the United States population). That would suggest that there are around four hundred produced in two days (10 is 2.5% of 400), or two hundred a day. That would be four thousand a month (assuming four weeks, each with five workdays). Considering that the most sold in a month were 14,207 in June of 2013 and March's 7727 was the best this year, that seems to be a decent pace if a little slow to start.
Now, let's assume that you are using a local area with a population of only two million. This could still be New York City if you only call dealers in a quarter of the area. Their two day pace would put them on a rate to produce sixteen thousand the first month, which is more than they can reasonably expect to sell.
If your local area is an even smaller portion of the US overall, this might not actually be low inventory.
Don't forget that some dealers may also still have 2017 vehicles left. They might want to sell those before they order too many new vehicles. Particularly as they may not know what feature packages sell best yet. If they're willing to tell you that they have three 2018s (and sold a fourth), they should be eager to tell you how many 2017s they have. A high 2018 price gives them a better chance to sell the 2017s at a profit.
If you really want to check if they are having production problems, ask how long it will be to order a vehicle. For a US manufactured car, special order should fall in the five to eight weeks range. If that's what they're quoting, then there probably are not production problems.
When trading with a dealer, do your research, tell them what you believe a fair price is, and then be ready to walk if they won't give it to you. Be up front. Tell them that you're willing to pay $X to the first dealer that takes the offer. You'd prefer that dealer because (whatever--maybe they're closest), but you aren't paying more than $X. If they let you get in your car and drive away, then they really think they can get a better price.