The Jang AP-1 single-row hand seeder has gotten a couple of rave reviews, here and in Tiny Farm Forum. It apparently way outclasses the Earthway, although (or, at only) about triple the price: $365US. It plants from small to large seeds (basil, carrots and lettuce, to beans, peas and corn). Also available in 3- and 6-row configurations. I haven’t tried it, but it seems like a must-purchase for increased accuracy and reduced seed use, adding up to much less thinning and cash savings. Available in the US from Mechanical Transplanter and in Canada from Willsie Equipment Sales.