Hey there. Here are some reasonable prices you can seen being asked for the following hatchling box turtles.
Gulf Coast hatchlings- anywhere between 25-40 dollars. There were 8 being offered by a Breeder on www.turtletimes.com in the turtle classifieds section.
Three Toed Hatchlings- somewhere in the price range of 25-45 dollars will be asked for. I actually just bought one(and am ordering another) from a breeder who is charging 50 dollars. It all depends really how they are cared for, these I could tell were extremelywell cared for, and are 5- 7 months old. 5 dollars more was worth the extra care!
Eastern hatchlings- 30-50 is reasonably asked for.
Ornate an average is 50-65.
Florida Hatchlings, since they are more 'rare' you can expect to pay between 100-135 dollars. I would not recomend paying more than 140.
Again It all depends where you buy and who you buy from. A breeder would charge more then a hobbyist who 'lucked out' and hatched some hatchlings. The care and habitat issue also plays a role in price. You will pay more for a hatchling that was VERY well cared for, and of course the age of the hatchling plays in as well. Check out turtletimes.com the breeder I buy from now, is advertising there. Quality will always cost more, just be careful they do not abuse this.