It seems like walterbyrd is just looking for some advice on where one can procure a basic inexpensive bike with a reasonable level of quality. Walmart can be a good source for bikes, but only through their online marketplace (where other brands and a much wider selection of bikes is available). The stuff on the shelves is generally not very good. Dick's Sporting Goods is actually not a bad place to try, either. Their bikes have been somewhat expensive since the pandemic hit, but at least they've had stock lately. Many of their bikes come with sized frames and they have a reasonable return policy if you end up not happy.

The Nishiki Tamarack might be a good starting point. It comes in sizes to fit many bodies and shapes and its components are basic but name-brand. It's under $300, and is probably a reasonable value at that price for a new bike with a warranty for light duty use.

As you know, there are used bikes out there for the choosing. You can often find quality bike shop bike brands for pretty good deals online. Comfort bikes are usually not the most sought-after and can sometimes be bought for 50% or more off the new price. Don't overlook an older bike in good shape. However, this means you need to either have the skills and desire to tune it up yourself, or a willingness to pay for this service from a bike shop, traveling bike mechanic, etc. If you're paying for that, then a used bike may not really save you money in the long run. Something like this Specialized hybrid for $165 could be a great option. I have no idea where you live, and that particular one appears to be sold...but deals like that are out there.