I suspect for "under $150" that the Red Mountain kit is gonna be as good as it gets.  Not a great instrument, but a serviceable. 

Folkcraft kits are $260-275.

  McSpadden has its Sweet Song Kit -- flat head hourglass shape -- for $155 which would be a better choice IMHO than the Cedar Creek -- better sounding and lighter weight...

Cedar Creek Dulcimers has a Red Meadow kit starting at $139.99. Red Meadow & other kits I have the Classic Walnut kit (shown at the top of the page) made as a chromatic dulcimer. I did not put the kit together myself and had them put the grooves for the frets & the sound holes in, which cost more. A 91 year old gentleman put the kit together for me and I tried to make it easier for him. The dulcimer sounds good. It is heavier than my diatonic dulcimer which is what I usually play. Scroll down on the page to click on the Red Meadow kit.

Who all makes a decent quality dulcimer kit for a low price, preferably under $150?