Unfortunately I think these are too wide to go into the $5.00 flat rate box but I may have a box big enough to hold three that's just a little larger than the flat rate box and will probably be about the same postage. I also have some shoe box size boxes that will hold 4 to maybe 6, who knows maybe more. Don't know how much it would be, no more than $10 certainly. Anyway here is a pic. Some are in 2"x2" pots and some are 4"x4".