I have travelled around a lot of suppliers over the last year or two, but 2 of the best deals I got, and which I eventually went with, were from the Co-Op in Carn (about 1yr ago) and Hegartys in Buncrana (about 1 months ago).
1st was for a solid oak, 2nd for a godo quality laminate for childs room. Very happy with both.
Both were got in sales, with the Hegartys one worth checking out if its still on. They also did a great deal on a couple of carpets for me. I was surprised I was able to get better deals on these occasions in Donegal than in Derry. You are almost conditioned to believe that NI has the better deals with Donegal always being a rip-off, but on these occasions I was pleasantly shocked.
Derry has simply too many wooden floor suppliers to check them all.