So glad that you and your wife are going into beekeeping together. It is so much more fun to do with a partner, especially when the boxes get heavy and jarring all the honey is a lot of work, but also sharing the joy of understanding nature better is invaluable.
I believe from the insider e-mails that February and March deliveries are all sold out now. April is the next available month.
What a great question! OK, my answer is going to be longer than needed, but you may want to read it a few times The short answer is, consider ordering right now for spring delivery. Here is what I suggest:
1. Join a local beekeeper society/club - there are 1000s all over the US, so I am sure that there will be one not too far from you. Partly you will get great local advice (the US has a huge variety of climates, all of which affect best practices in beekeeping). But also, you may meet people who run great apiaries with locally adapted bees for sale. Best option is to buy from a member - they don't want you to have a bad experience, because they are going to see you at regular meetings!
2. I would ask members of the above club whether they have recommendations of a supplier. For a beginner, I suggest you order a nucleus. They are more expensive, but much easier to install and nurture through the first few months. However, most nuclei sell out in late Fall or early Winter of the previous season, so you may not find any available. In that case, you will need to buy a "package", but again get local recommendations. The further the bees have to travel, the less well they recover.
3. In your part of the US, I would expect that most beekeepers will run their hives on "double deeps", which means 2 brood boxes. The Flow hive comes with one brood box, so you will want to order a second box. They are not expensive, and you can get one to match the Flow hive from here, just make sure you choose the 8-Frame option to match your Flow hive if you ordered the full hive:
I would actually go a step further, and order the screened bottom board, frames, inner cover and roof (telescoping cover) from the same place. It might set you back another $122 or so, but you will have spares, and you can get your bees set up right away if the Flow hive has any delays.
Meanwhile, read this whole forum, get some books and talk to other beekeepers. If you can do some classes or join others when they start inspecting their hives in the early spring, so much the better!
Finally, welcome and good luck in your adventure with bees!