Here is a list of free or low-syn options available in Dunnes Stores. I'm adding to this all the time. Feel free to let me know of any others you can suggest! 


Activia Fat Free Yoghurts (Free except for the peach which is 0.5syns)
Alpen Lights, all flavours (2 for healthy B)
Blue Dragon Express instant noodles (Free)
Choc Shot Hot Chocolate (1 teaspoon is 0.5 syn)
Mugshotz
Muller Lights
Quark
B Free Wraps (1 for HeB)
Fry Light all flavours (Free)
Healthline tea biscuits (0.5 syns each)
WOW Steak burgers (Free)
WOW chicken arrabiata each 2.5 syns
WOW pork sausages, 2 sausages 0.5 syns
WOW sweet chilli and garlic turkey sausages, 0.5 syns each
Wow meatballs italiano in a tomato sauce, 256g serving 1.5 syns
Hodgins Low Fat Sausages (1 syns per sausage)
Country kitchens bakery multiseed bagel slims (HeB)
Wholemeal sandwich slims (HeB)
Dunnes OB Bacon Medallions (Free)
Philadephia Light (HeA)
Almond Milk, Unsweetened (HeA)
Kandee Tomato Ketchup (1syn for 50g)
Kelkin 100cal snack packs micro popcorn (5 syns per pack)
Knorr Chip Shop Curry Sauce (2.5 syns for a sachet)
McCain Rustic Chips 3% fat (1syn per 100g)
Rankin brown soda bread 400g loaf (55g for HeB) 
Pink n Whites (2.5 syns each)
3 for €9 deal - Dunnes OB Turkey Breasts, Chicken Fillets, 2x Chicken Breast on the bone (skin removed), Salmon Fillets - all free
Heck Zesty Chicken Sausages - 2 sausages 0.5 syns
Heck Chicken Italia Sausages - 1 sausage 0.5 syns
Heck Smoky Paprika Chicken Sausages - 2 sausages 2 syns

Please let me know of any other gems you come across in the comments below!

RELATED :

Tesco
Lidl
Aldi