See below, has anyone used such small cell size for growing lettuce 
transplants, and with what success? thanks, Vern

We are using a 128 cell tray for lettuce and greens right now is looking 
at a similar sized tray from Proptek which has 144 cells.  The cell size 
is actually the same, but they fit more cells per tray because they 
don't need a rolled edge on the tray for strength like regular 
thermoformed trays have.  You can check them out at 
http://www.proptek.com/pages/vegetables/trays/index.php?ref=144N10N.  
The issue is that the 144s are made in California and the freight quote 
I got was $2500.  Proptek also makes a tray in Montreal which is a 231 
count.  The cell volume is about 60% less.  From the little I know about 
it, it seems like most growers out West use much smaller cells than we 
do here for lettuce and greens.  Everyone I know in this area uses a 128 
or similar tray for these crops.  Do you think we could get away with a 
231 tray for these crops?   Do you know anyone using a smaller cell tray 
for lettuce?