Vetiver was super easy from my experience. I was growing it both in Taiwan and in Hawaii - subtropical climates. In Taiwan I went from getting a few small clumps one year, to selling starts by the hundreds a couple of years later.
$50/slip is unbelievable!
On a positive note that could mean there is some opportunity for you. if this is really the only source you are able to get it from in order to get started then even the $50 can be returned very quickly in just a year or two. Be the person that doesn't rip people off, and you'll get more of the support.
I was selling mine for less than $10 per 5 bare
root starts, and if people ordered more they would get a better price.
I did bring a couple of starts to my new home here in a much different climate, and they are sitting in a
bucket overwintering on a windowsill. They haven't grown at all, but are still hanging on. Will see what happens in the next couple of months as the temperature starts to rise and there is more sunlight available. Vetiver seems to really need a lot of sunshine. Otherwise it can handle very extreme conditions, such as droughts or extended flooding.
Maybe try reaching out to the community in the TVNI group:
https://www.vetiver.org Theres gotta be someone in there that can help you find starts closer to you for a more reasonable offering.
UPDATE: At this site there is a supplier listed from Texas.
USA Warren Sullivan
Mosquito Hawk Farms LLC
Anahuac, Texas
Tel: 785-550-8297
warrenskully@gmail.com
A quick search brought me this result from Florida:
https://www.greendreamsfl.com/online-store/search%3Fkeyword%3Dvetiver
$15 for a 1 gal pot that you can separate out into a bunch of starts is way better than $50 for a single slip...