You buy them from Lego Education. You can only buy one kit for each FLL team you register.
Without a team, your best bet is to ask here if anyone has an extra kit they are willing to sell you. You can also try eBay, but that tends to be very expensive.
On Sunday, November 30, 2014, Kuppusami Natesan <[log in to unmask]
Hello. Wondering where and how to get the FLL Field Mat and Mission Models. Would appreciate any help.