Lamotte Alkalinity is a good one(same as KH), 18$ or so, but you get 4 ppm accuracy and most of the other can only hope for about 8-9ppm at best with a modified method(2x the sample volume, so you use 10mls and each drop is = to 1/2 a degree of KH(1 degree = 17.86 ppms).

Regards,
Tom Barr