The feat Magical Artisan (Player's Guide to Faerûn 41) in its description says, "You have mastered the method of creating a certain kind of magic item," and its benefit says, "Choose one item creation feat that you possess. When you make an item with that feat, you pay only 75% of the normal cost to create the item."
The item creation feat Extraordinary Artisan (Eberron Campaign Setting 53) that has as its benefit, "When determining the gold piece cost in raw materials you need to craft any item, reduce the base price by 25%."
Can a creature that takes the feat Magical Artisan pick the feat Extraordinary Artisan, therefore allowing the creature to realize the benefits of both the feat Magical Artisan and the feat Extraordinary Artisan for, essentially, any magic item the creature creates?
Note: This combination is suggested by the fan-made "Complete Cost Reduction Handbook" and on the Giant in the Playground forums like here but nonetheless strikes this DM as an overreach. That is, a creature never makes anything with the feat Extraordinary Artisan but with an item creation feat like Scribe Scroll. Further, a creature doesn't so much as make an item with the feat Extraordinary Artisan but simply sees a reduced cost because of it. Nonetheless, my players are adamant about this combination, citing the "Handbook" and messageboard posts as proof that this is a valid combination.