Yes, and no

How many do you need? If it is 2 the new lock comes with it already. If you buy two locks with same serial number then you got 4. You will need to replace 3 locks usually hence you got 2 extra key for your next assignment. So you see you can manage it to have 6 locks for two houses without the need of buying or making any keys!

If you are handy enough, try this one:

http://www.ebay.com/itm/NEW-LOT-100-Ilco-Kwikset-KW1-1176-Keys-Blanks-Nickel-Plated-Locksmith-Locks-/260937981072?pt=LH_DefaultDomain_0&hash=item3cc11d9c90#ht_608wt_1361

100key for $35 or 0.35 each ... It is close to none, right?

If you really need extra precut keys:

http://www.ebay.com/itm/Precut-Kwikset-5-pins-KW1-Keys-locksmith-20-sets-10-/120634407824?pt=LH_DefaultDomain_0&hash=item1c165efb90#ht_500wt_1381

haha, google is your friend, my friend!