flavel aspen100 electric oven not working ignition for gas or timer?

the clock has not worked for sometime and its not something that had worried me to much, when I turn the power at the wall on to the oven it had been making a ticking noise, which was annoying but that was all, then the other day half way through cooking I noticed that the red stat light to oven was not working then I figured out that the gas ignition button was not working, I think its the therma fuse that is broken from what i have read on line.where can I buy this from as every where says not avaliable,