>> Has anyone bought seeds off of sites like ebay?
Twice, from the same vendor, a few years apart (but he was not part of eBay, so this may not be a directly relevant answer. I do know many people who love eBay.)
"Water Spinach" = Ipomoea aquatica (semi-aquatic sub-tropical crop, invasive in warm-wet climates)
"Water Morning Glory" = "Water Convolvulus" = "Swamp Cabbage" = "Chinese Spinach"
Indonesia: "kangkung" or Kang Kong
Mandarin: "kong syin tsai" (hollow heart vegetable)
The first time, I got the seeds - great, considering that they are barred from import to the USA because they would be invasive in southern FL.
The second time, I sent my money and got nothing for a long time. I finally reached him somehow and he gave me a suspicious song-and-dance like "they'll be in the mail real soon". Of course, nothing ever came.
THEN I researched him and found that he had been keeping a LOT of peoples' money and sending nothing, for some years.
I would avoid him even though he had a lot of variety advertised at one time.
(I am VERY slow to forgive someone deliberately tricking or taking advantage of me.)
My experience with him, eBay and "etsy" (that name may be wrong) convinced me to stick with "real" vendors whose business plans include SATISFIED customers. It seemed to me that eBay was set up EXACTLY for cheating vendors like him, and for customers who don't want any recourse if they buy from a lying thief. YMMV, and a lot of people do disagree with me about eBay.
Probably, if you know the SPECIFIC vendor you are buying from, they could be great. But just because they spout some charming popular rhetoric doesn't mean that they BELIEVE it, or that they aren't glib crooks.
(Capitalism means not having to say you're sorry.)
(Admin edit to remove email)