Great idea Faith
I buy my fish from the Ballycotton stand - K O'Connells have a superb selection but I prefer to support the "little guy". Ballycotton tend to be a bit cheaper too.
The bakery sells a fantastic "Country Baguette" - can't remember the price but it's not expensive and it will last until the next day too.
The 2 asian shops are great for rice, and very cheap for coconut milk - I buy them as solids in a carton - they are 1.10 each and I only use half of one for a thai curry that will feed 6, so superb value here compared to tins in the supermarket which are often 2e each.
The fresh pasta from Aygo is also very good and reasonably priced IMO.
If you are in the Market midweek at lunchtime, the beef butcher at the Grand Parade end (opp the palce that sells the olives) cooks burgers on a grill and they're superb.
I buy my chickens from Moynihan's - their large, free range chickens are 9e and they're great.