I have done some of both and find it completely impossible and futile to compete with cabinet door factory pricing for paint grade, shaker, off the shelf type designs and sizes if that’s what someone wants. The only time it “makes sense” to make standard design doors is if there’s a timeline crunch or if there’s only a small handful.
I do tend to like to keep things in house, though, and tend to take on projects that are not standard so my value proposition of true customization is actually valuable to the client. And I am not a cabinet shop, though I do tend to take on occasional smaller scale custom cabinetry projects at times.
You could order these doors from a cabinet door factory online or locally/regionally and get them for probably around $1k +/- depending on location, etc.
I ordered a kitchen’s worth of sanded but unfinished doors for a re-facing project once and it cost a little more total than what my estimated raw materials cost would have been, not to mention the labor to build them. Not sure if the scale is there for 8 doors (and only 2 different sizes), though.