You should be able to make one out of 1" PVC pipe, assuming that the original pump is the 637 1000 gph model.

If you have or can get an extra hose, a bicycle inner tube, 1" PVC pipe, a few fittings and hose clamps you can make one very easily.

1" PVC has an outer diameter very close to the inner diameter of the small Intex hoses. For good sealing between the hoses and the pipe, a short piece of inner tube is placed on the outside of the pipe and the hose slipped over that.

Think about it a bit, and I bet you can come up with a very good one. For your area, many small holes in the pipe will give you more of a mist.