I was going to buy some P5 Panels off aliexpress. Same place that MrGrumpy is getting his panels.
Specs:
64x32 Pixels Panel 320x160MM Black LED P5 Indoor SMD2121 Full Color LED Module 1/16 Scan ,HD P5 Indoor LED Video Wall Panel

I live in Columbus, and travel to Dayton regularly.
If anyone would like to do a combined purchase with me the cost, with air express delivery can fall to about $17/panel.
A combined purchase would save us about $3/panel.

PM me if interested.