Just out of interest, one can still buy leavening agents throughout the whole week but it is impossible to buy wheat products of any kind as well as any products made from barley, spelt, oats and rye. The Rabbis have ruled that only matzah and matzah flour is to be used during this week. Matzah is made with wheat (makes no sense) and made in accordance with Rabbinic rules, not Biblical ones. God has no problem with food that rises or swells and does not have an issue with bubbles in unleavened bread.
Exodus 12:15
Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
19 Seven days shall there be no leaven found in your houses: for whosoever eateth that which is leavened, even that soul shall be cut off from the congregation of Israel, whether he be a stranger, or born in the land.
20 Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread.
Leviticus 23:6 On the fifteenth day of that month the LORD's Feast of Unleavened Bread begins; for seven days you must eat bread made without yeast.
Psalm 19:
7 The law of the LORD is perfect,
reviving the soul.
The statutes of the LORD are trustworthy,
making wise the simple.
8 The precepts of the LORD are right,
giving joy to the heart.
The commands of the LORD are radiant,
giving light to the eyes.
9 The fear of the LORD is pure,
enduring forever.
The ordinances of the LORD are sure
and altogether righteous.
10 They are more precious than gold,
than much pure gold;
they are sweeter than honey,
than honey from the comb.
Some sweets, 
some beans, 
all the rice and pasta,
and things containing vinegar.
• May. 16, 2009 - Untitled Comment
JoAnn