Everyone will agree that you should know your breeder. You want to know how your breeder feels about inbreeding, and neonate care.
Personally, I hand selected my 1.1 from two separate clutches. Unfortunately, due to a bad choice of pet sitters, I lost the male a few months later (1996). The female did well, and a year later I was able to afford another male. Both were from very different dealers and good bloodlines (as evidenced by the 20+ clutch sizes).
I have successfully bred these two twice and I anticipate my third clutch later this year (after giving them a year off for ethical reasons).
There are a lot of dumeri's out there; they breed readily and have large clutches. For this reason, the prices have come way down since the 90's. Average price these days looks like $125, which is comprable to other boas.
Young dumeril's will like a substrate that allows them to burrow in. They will disappear in aspen or pine shavings. I used to use pine bark mixed with shavings for a bit of a natural look. Neonates are happy in a shoe box sized rubbermaid container for a few months. They appreciate the privacy compared to all glass enclosures. They will frequently be seen caudal luring while almost fully covered in substrate.
I have had very little problems with feeding these guys (about 20 total). A previous post stated that they were among the hardest to get to eat, but I disagree. Having dealt with numerous imported ball pythons, I know what picky eaters are. Dumeril's require some patience, but are not hard to get eating. I have had all of my babies eating within one month of birth.
That said, in the 8 years I've had my female, she has gone off feed a couple of times. This generally coincided with cooler months of the year and/or agressive cage mates. My male has gone off feed a couple times also, but this has generally coincided with breeding. A couple months is nothing to worry about; six months is.
These are very rewarding snakes. Thier size and demenor are definite advantages. I'm sure you will be happy in your endevour; I was won over immediately. I haven't wanted another species of boa since (well, I do have an ATB on the way).
Good luck,

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Zoodude
"Just because I'm paranoid, it doesn't mean they aren't after me."