Standard sales and I stay sold out on all these and ALWAYS get these prices (last 3 months from the date of this post or longer).
ELITES:
Necro - 11-13k (13 rarely, 11 or less in a snap)
Monk - 10-11k (9k is a snap, 11k is hard sometimes)
Dervish - hard sales no matter price 5-8k always seems harder to sell. Sold last couple at 8k though.
Paragon - always harder sell anything from 7 to 4k, last-3 @5k each.
Assassin - 4k, but can do 5k most likely because 4k is a snap sale every time
Ritualist - sold all very fast @ 10k, but am certain next one I get will get 13k. Demand is very high lately.
Mesmer - harder sales period (vettir prices still left an impression on people even though keg farm is gone) 5.5k pretty easy sale... higher possible but difficult
Warrior - 7k easy.... even when goofballs are selling them for 5k in same town.
Ranger - 8k, 7k easy .... again...even when goofballs are selling them for 5k in same town. But the goofballs get to sell theirs first many times.
Elementalist - 8k ... always, and sometimes instant sale, other times its a wait.
NORMAL (this is a jaw dropper I am sure):
Monk Normal: 2.4k ALWAYS, and sell while don't other things in town. Up to 26 now at this price. Rationale: high demand for new characters, not farmed to death, and anyone willing to pay 1k will pay 2.4k just as easily. Anyone paying less can just go make they way to a trainer for 1k. Demand is too high for them to be any cheaper, but people sell them cheaply based on the cheap prices of the other professions. These skills from tomes for monk are too important most of the time for people to wait to get to the proper trainer, thus 2.4k... always

[26, and climbing soldout of course too]
Best of luck on sales, and if you are looking to buy cheap from me... you need to talk to someone more desperate for a sale.