The two week old firefly is too young to be going anywhere so I would hope the actual trade will be happening in a few weeks after it's eating reliably. A reputable seller will make sure that a hatchling has taken at least 3 (I prefer 5) meals before going to a new home. At two weeks old it may not have even taken a meal yet.

The price on that one seems high to me, BHB has a 2015 on his site for $300 BUT he's a big name seller so he gets premium prices. There are 2 ads on Fauna now for other females, one is a 2015 for $200 and a 2013 for $325.

The lesser bee enchi will be harder to value as there are not many four-gene animals on the market, especially females. I would expect to see a higher price than $500 for one, even with the declining prices. I would also post a pic here to verify it is a four-banger rather than just a lesser bee or enchi bee.