Sorry Hyper, but the only way you're gonna get Improved Critical is if you take a flaw. It will have to be a defining trait of your character, and you must role-play it accordingly.
I'll consider it. Do you have a list of flaws for me to choose from?
Yes sir, these are the real McCoy, and for the ridiculously low price of 50 gp, one of these little babies can be yours too! *he sounds quite convincing*
Lorethel: "Orcs, Dwarves, WHAT'S THE DIFFERENCE!? All I see are a bunch of dirty, ugly, warmongering, ******, *****, ****, **********, *******! Now, GO AWAY!!!"
Merchant: "I told you, they protect you in any occasion,and can be yours for only 50 gp, hurry, supplies are running out!"
Lorethel: "UGH, you stupid ******* Dwarves, you're ugly, sound horrible, and you reek with an odor so foul. Do you know what you smell like Dwarf, DO YOU?!"
"NOW GO AWAY!!!"
Merchant: "They do everything to ensure that no harm comes to your person, and I offer them for only 50 gp apiece. One use only..."