I have bred some species a few times and I can tell you that the mentioned prices are not very realistic.
peringueyi as a CB Baby will go for 250-350 Euro/ea
caudalis as a CB Baby will go for 250-450 Euro/each depending on coloration and location
SA cornuta as a CB Baby will go for 350-500 Euro/each also depending on coloration an location
xeropaga as a CB Baby will go for 500-750 Euro/each
worthingtoni as a CB Baby will go for 500-max. 700 Euro/each
armata, rubida, albanica etc are (usually) not available on the market and prices are definitely higher
That's my two cents from my experiences and feeling
Cheers Marco