I think that after they are 6 weeks old they are getting pretty hardy.
Apparently the company offering the sexed poults has discontinued that policy as they no longer show sexed poults on their site.
They offer broad breasted turkeys and varieties that are in between broad breasted and heritage turkeys. They do no list the minimum quantities that they will ship.
http://www.valleyofthemoonturkeys.com/products.html
There is only on breed and that is turkey.
Porter's Rare Heritage Turkeys used to show a disclaimer because of a Federal law that prevents them from shipping turkeys as pets so when buyers answered the question that the turkeys would be pets, they would not sell the poults to them. It has to do with a Federal law about buying pets unseen that causes certain liabilities to the vendor that they did not want to deal with.
I try to keep at least 4 to 5 hens for one tom.
I recommend a minimum of 10 sq. ft. of clear space per adult turkey in a coop. I also recommend at the barest minimum 20 sq. ft. per turkey in an attached run with 100 sq. ft. per turkey being far more appropriate.
Heritage turkeys do like to roost and I provide roosts at a staggered height with the upper roost at 6' high.
The sex linked varieties are either Narragansett (n) based or Chocolate (e) based.
These are currently the only sex linked color genes. The toms can have a pair of these color genes (nn) or (ee) while the hens can only have one of the genes (n-) or (e-) and cannot pass these genes on to their daughters but can pass it on to their sons because they are linked to the male chromosome only.
The ones where the poults can be sexed at birth are normally crosses which will not breed true.
You can check out the Turkey Color Calculator at Porter's site trying making different crosses including the Narragansett or Chocolate genes to see the possibilities.