well I have only done 18 quests from Jhudora but done 23 on Illusen, as far as I can tell from all the screenshots I got. Illusen requested items(of quest 16,17,18) seems ways less expensive than the recently 3 Jhudora requested items... Jhudora asked me around 7000np, 8000np and 5900np items in the past 3 quests.

Though I gave up on Illusen because she was asking me to get her a 65k-75k(cant remember the actual lowest price) toy when I am doing level 24. Now that toy's price dropped to around 6000np