A good discussion about the options that the states have going forward, and what might limit them.
https://www.gwlr.org/south-dakota-v-wayfair-inc-seemingly-endless-debate/
More discussion about a few states plans
https://www.avalara.com/us/en/blog/2018/06/states-react-to-supremecourtrepealofphysicalpresencerule.html
30 top questions from a recent webinar
https://blog.taxjar.com/top-30-questions-south-dakota-v-wayfair/
States with economic nexus laws
https://blog.taxjar.com/economic-nexus-laws/
Good discussion the what retailers can expect from the states.
https://learn.sovos.com/blog/leading-sales-tax-expert-charles-maniace-comments-on-south-dakota-v-wayfair-supreme-court-decision
An interesting perspective on the impact of the thresholds. I haven't seen this come up so it'll be interesting.
https://dakotafreepress.com/2018/06/23/citing-sales-tax-uncertainty-michigan-folder-seller-rejecting-orders-from-south-dakota/