No its not free now.
The generic info on the SW website has canned macaroni cheese as 2 syns per can on green and extra easy, or 1 syn for reduced fat varieties.
However, different brands probably vary greatly so you can use that as a guide but might want to check syns online for the exact amount.
if you havent been for a while, lots has changed, it might be worth going to a group, even just for one session to get the latest books, new member talk and at least a little access to the SW website for a short while. Its £5 joining fee and £4.95 for the week so just a tenner for all that info.