Here is the sort of tray I was referring to and I believe that this is the type that I have. These are polystyrene and should be rigid. They also make some really cheap, but I'm guessing that those are soft plastic and would be impossible to pick up to pour chemical solutions out of.
One note - the film just fits in these trays. If you are using a developer that needs a lot of agitation like I do (I use PMK Pyro), too vigorous agitation can cause a different level of development around the edges of the negative/tray so you need to be a little more gentle than normal.
http://www.greenhousemegastore.com/p...ray/seed-trays
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