First, what CPU? Intel Core i7 920 or higher?
LGA 1366 motherboards should still be out there, with X58 chipsets.
You could get a Asus X58 Sabertooth here.
An Asus Rampage III X58 is here.
A new different LGA motherboard requires new CPU, new RAM. Should be over $500.00 ($220 mobo, $280 CPU, $50 RAM).