I had to pay $30 US for an I-94 when I was crossing the CBX for a five day Thanksgiving visit to family, contrary to what everybody says so expect to be surprised.
https://waggonerguide.com/canadians-face-stricter-u-s-border-crossings/
A plain-language guide to what the research now shows
https://www.malone.news/p/what-your-covid-booster-did-to-your