Some of my favourites are:
2 finger kit-kat = 5.5 syns
Cadbury's light chocolate moose = 3 syns
Curly Wurly = 6 syns
Cadbury's Fudge = 5.5 syns
Milky Way (1 bar) = 3.5 syns
Flying Saucers = 4 for 1 syn!!
Squares crisps = 5 syns
Frazzles crisps = 6 syns
Snack a Jacks Jumbo Cheese = 2 syns each
Hope this helps!