I picked up a few cheap water bottle cages for my kid hauling bike from walmart. They are made by a company called 50strong. I have used their water bottles and have been happy with them so far. Just in case anyone is looking for cheap cages. They are less than $5 in my area. Attachment 448788
I haven't been able to find any mention of them so I thought I would give a quick review.
I ended up swapping them with the alloy cages on my road bike because 1) they were lighter 2) it is easier to slide the bottle in and 3) there is less vibration and movement with full bottles.
BTW the bottles are <$3 and well... They are bottles. They leak a little when over turned but so do most others. Almost a year on the bottles but only about a month on the cages. So far so good.