some thoughts -
Dallasframes in belfast shore road will do you trade prices for bulk frames 20 or more I find them good value with a good selection of frames.
Do small sized images no larger than A4 and offer them to Bars, Restaurants and local shops in your area or near the landscapes.
Some places will showcase photographers and artists work with prices included. They get cool images and a cut of each sale
Or alternatively try ebay and hit the .com site to reach out to the american market who should local Ireland lansdcapes ( far simplier option and one you can sell as prints or framed images). Why not limit them to 500 prints and number each one sold that way you can market them as limited editions. Look at the shop option and build your own shop - Irish Landscape Prints or Emerald Isle Prints or something cliche