They're probably all from the same factory as the X2, but 2 weeks ago I bought a couple of RioRand 2X (1500lm) off of Amazon for $30/ea. They look identical to the set I bought locally for $100 last year. At this price, I'd be happy if they got me through a year.
FYI...the set I bought last year is still working fine.....I was just looking to add a set to my handlebars. Because of the price, I picked up another one for my son.