When it gets closer, they will populate March and April. Under each breed it will show hatch dates. Unless they run out before you place your order, you just order them before the hatch date. For example, if you aren't worried about slipping to the following week because they ran out, you can order Friday to ship the next Monday. (This would allow you to monitor the weather to avoid predictable cold snaps and such.) Otherwise, you can order as far ahead as you want and they will ship on the Monday you specify.
I know their pricing seems hard to follow too but really isn't. I will give you a mock up similar to my two orders. One was minimum 2 birds and one was 10 birds but I will use all fawn & white runners as the example all sexed female.
Duck price unsexed = $5.95 x 10 = $59.50 so more than $40 - use actual price.
Ducks 10 x $7.85 = $78.50
Grow gel $0.55 x 10 = $5.50
So the total would be $84 + actual shipping.
Duck priced unsexed=$5.95 x 2 = $11.90 - subject to $40 minimum price (sexing is $7.85 - $5.95 = $1.90 / bird)
Ducks $40 + 2 x $1.90 = $43.80
Grow gel $0.85 x 2 = $1.70
Heat pack/insulation/sealing most of the holes (small order charge) $12
So the total would be $57.50 + actual shipping.
And having run the math, the minimum charge for F&W runners will be charged on anything under 7 runners (7 would actually cost $41.65 before sexing).
So Noir and Mystique were really expensive!!! but heck, they eat more than that in meal worms every year