I sort of did the same thing (bought a yearling) with my carpet. In someways I wish I'd bought from my friend Ed Lilley from Constrictors NW and taken his subadult.
I'll say this, if you went with anything from Kali, it would be probably the most conservatively raised young adult you could get. She is religious about her feeding.
Personally, I feel the difference between a well cared for 2 year old boa VS a baby, other than size is not a big deal. You get to skip a lot of the defensive bite stage and you'll 100% know the snake is eating well.
1/2 hour is pretty close. Might be worth a visit.
Also consider you can start with possibly your lifetime cage VS having to upgrade soon.
If I lived in MI that close I'd pay her a visit!!