Sorry to revive a semi-zombie thread (half-undead thread?), but I too have been searching for grow pot solutions for a while, and just now found this thread. I see you
@Fan Tan Fannie mentioned SuperFly, which does have a nice selection but seems to tend to be out of a lot of things, and shipping seems to be about as much as the stuff you order. I am posting because there is another place with a good selection, House of Bonsai (
https://www.houseofbonsai.com/collections/plastic-training-pot?page=1). Unfortunately, their shipping costs also are on the order of the cost of the pots.
Wrt the Anderson flats, they seem more a wholesale thing. I did find a place that distributes them (
http://www.stuewe.com/products/anderson.php), but have not gotten around to calling them to see if you can get a few instead of a pallet. Their site does have prices for small quantities, so probably they do. My guess is like everything else bonsai, the shipping will cost as much as the product, or more. Hope this helps!