K.B.
Here is a wooden highchair for a good price....
http://www.nathosp.com/product/wha_c/high_chairs
I can not find a stackable highchair that comes with a tray for under $150-200.
Here is something, not stackable BUT by simpley changing the position can be used as a adult seat. ($100)
http://www.walmart.com/ip/Badger-Basket-Wooden-High-Chair...
Here is two folding highchair: ($100-$200)
http://direct.tesco.com/q/R.###-###-####.aspx
http://www.albeebaby.com/bloom-nano-folding-high-chair-in...
Do not know of any others in a more resonable price.