Do you have some photos? People usually sell them to me for $5 + shipping
:rollhappy: :evil:
But in all seriousness, assuming you're in the USA, for a healthy and well grown P. caudatum that's blooming size and in the 1 - 3 growth range, I'd expect to see them for $35 - $50 USD. Maybe a bit more if the plant is exceptionally large or has top notch parentage.
Of course divisions of awarded clones will go much higher, and some specific varieties or sister species (P. humboldtii / popowii) tend to also fetch higher prices.
Another factor that may come into play is that plants which are in spike, bud, or bloom can fetch a bit more money (10% - 20%, but sometimes up to double price or more) in the right circumstances. Of course if it's blooming and it turns out the flowers are poor quality, deformed, etc, then that can have the opposite effect (i.e. reduce the value of the plant).