All 403 of the aired, half-hour episodes are on YouTube, but they've recently been monetized to hell, so one minute you're listening to Bob at a reasonable volume, and without warning a loud ad comes up, 3 or 4 times an episode. But they have also lately been added to Tubi, a free streaming platform, with only one ad break at the beginning and one more about 20 minutes in. The volume is equalized and they give you a little countdown in the corner before the ads start. I suspect the crazy number of ads on YT are BRI's design to drive viewers to Tubi or DVD. Because cha-ching.
There are also a couple of the later seasons on the PBS app, commercial-free, if you're already a PBS supporter.