They're in the top part of Eyre Square, in the shop that was recently a branch of Matt O'Flaherty pharmacy - just along from Supermacs and the Imperial Hotel.
First and foremost, they sell greeting cards: birthday cards, anniversary cards, wedding cards, congratulations, get-well - and more. They also have "gift dressing materials" (wrapping paper, ribbons, decorative bags, etc) and small gifts / filler, and "partyware" (streamers, balloons, etc). And they offer a balloon-inflation service.
