Plenty of smaller easels available from the usual sources - If you were closer, I could chuck a two blade one your way.. Bigger easels that would handle 16-20" paper, even second hand, are often expensive. An alternative is to use drawing (draughting) board or table cloth clips to secure the paper to a large board. Or if you can find a suitable sheet of steel, some magnetic strips could be used.
Originally Posted by healingvirtue
I face the same issues - Got a couple of 40" rolls to use, but no big trays or easel.