I saw those too last week.
They are a good deal for only $6.96. The thing that sucks is they are entirely plastic, arn't they? I would like some solid metal to screw thru to mount it to the cabinet... I would worry if you move the cabinet or shake it the plastic will eventually break. But metal ones are more expensive.
If I got one, I might just remove the parts (bulb, 2 holders, starter and ballast) and mount them directly to a board and screw that in place, and paint it all white for more reflection.
But if you don't care about "original", you can't beat their price... I know.. I've compared to Kmart, Target, Home Depot, Menards and a few other regional stores, and $6.96 can't be beat for an 18" fixture.