I bought a Magic Line Mini Tier set on Ebay. It included the 4 in pan. I found this on ebay now :
http://cgi.ebay.com/Magic-Line-3-Tier-Mini-Cake-Pan-Set-2-3-4-x-2-NEW-/290553699726?pt=LH_DefaultDomain_0&hash=item43a6599d8e#ht_3066wt_1110
If all else fails, bake the cake in a 6" pan and them cut them down to a 4" cake; or you could bake a sheet cake and cut the 4" & 6" rounds from it.
Global Sugar Art has them. I bought 2 by Fat Daddio's.
Can't remember where I got them, but I love my 4 inch springform pans. They are awesome.
@azeboi2005 what did you use to cut it to 4in
@hisnhersparty I'd use a template or cake circles to cut the layers needed. Another alternative would be to buy pastry rings and use them to cut the cake. I'd suggest chilling the cake or sticking it in the freezer it'll help make a cleaner cut.
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