IMO, if you're planning to have the boat more than a couple of seasons, the Duck's Back type covers aren't great value. If there is a lorry covers maker close by, consider having a custom cover made. You can tow with them on and they can be pressure washed. They last for MANY years. I wouldn't expect to pay more than €200 for a piddly wee boat like that...
Cunningham Covers in Maghera are the go-to guys at the mo. They have a depot in Naas too. Dunno if their man Walter works down there - I'd guess he does tho.