i bought a single jet at dealer today, was 3.75 they have a full box of assorted jets, asked the tech what to use and he gave me the washers and got the jet himself for me, heck of a nice guy :0
local performance shop should have them, my dealer will charge about 6.50 for a single jet, and the shop sells them for 3.50 a piece, so look around you can find better prices