There are shops/instructors in Ohio who offer a dry suit option for OW, and I bet any dive shop would give that option to an OW student willing to buy a dry suit. In addition, there are probably a lot of people diving dry without any certification. I was at a DUI Demo weekend at a local quarry attended by over 200 people, and they were comping DM's and/or Instructors to get them to volunteer to accompany people trying out their suits who were not dry suit certified. As far as dry suit checkouts in a pool prior to arriving at the quarry went, it was don't ask/don't tell. At least 100 people (some of them friends of mine, dove dry for the first time in their lives with no more than a five minute briefing, and the DUI reps were taking direct orders for suits. I used a dry suit a few years before I eventually took an ice diving class that included dry suit certification.A very large majority of OW classes here in Sweden will be done with wetsuits.
It's hard to make money doing OW classes here as it is and the added expense of stocking a ton of rental drysuits to fit students is financial suicide for the majority of dive shops.
I'm glad I was able to do OW/AOW with a drysuit here years ago, but it is DEFINITELY not the norm.
Most people who go on to take further classes end up in a drysuit though, it's a must have here unless you want to limit your diving to the summer months only.