Here is my accumulated NYX Lipliner pencils that I have bought over time from different sources.
I own nothing but NYX pencils and I can say, when it comes to lipliners I prefer this brand over higher end brands such as MAC or Stila. With that said, they don't have the longevity as other brands (say, Make Up For Ever) but they're not claimed as long lasting. I get a good 5 hr wear for outer lining and about 8+ if lips are fully shade in with lipstick on top - less if I'm eating/drinking. Some of them do look similar to one another which is a gripe. The consistency is more on the matte side but they glide fairly easy. There's two textures I've seen, one being the matte, the other a satin. All but one (coral) have a matte finish. I totally recommend these for budget friendly beauty junkies.
The long lip liner tends to run cheaper with fewer selections as oppose to the regular l/l, usually $1.25+, and the smaller sizes can start at $1.75+ each depending on where you purchase them from.
Where I've bought are CherryCulture, NYX official site, Ulta Stores and individual retailers/boutiques. But as a tip, I recommend eBay sellers - it ended up being a little less then CC even with their discount (unless it's an annual sale than I would recommend either NYX or CC). Browse around and add tax/shipping to see the best price.
Hope this was helpful.
Check on my follow-up post for comparisons liners and compatible lipstick shades.