That's the main reason, I think, to use actual just straight potting soil in flats and not plugs or plastic trays. Luckily you can get the larger pots for free most places (folks are always getting rid of them), but the starter plugs are hard to find for free and break apart pretty quick. The unit in the picture was given to me...I haven't been able to find it online or at any store.
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very true. i am keeping my eyes & ears open over the next few months, as people will likely be getting rid of stuff soon - i want to start planning for next year!