Well - pure Kalatoas are about $1K each(average price), but other SD localities are more expensive - if you can find them. Pure F1 Kayuadis are usually about $1,500-$2,000 each.
As for breeders who breeding them - Garrett Hartle of Reach Out Reptiles has a waiting list of at least 6 months for his pure Kalatoas. Samson Pruitt of Slither, Inc also has some pure Kalatoas, & pure F1 Kayuadis coming in the next few months.
I wouldn’t recommend Samson but I won’t try and derail this thread on that topic... simple google search will tell you all you need to know.