That's why WTB on TPT is your friend.
I cannot count how many times I've seen "best place to by plants" threads: do a quick search and you get a lot of pros and cons, including mine's.
And yes, I am biased as I sell a lot of plants on TPT.
Edit: and yes, I am a bit gleeful: my PM box is full of PMs from people asking about plant recommendations, growth patterns, dosing, prices, layout, "best lights", etc. A dozen PMs from the same person are not uncommon.
Some say Thank You, most don't bother.
And then they disappear and get their plants "on line".
This is my rant of the day.
Edit: some plants like Limno Cuba can take a month+ to convert to immersed form. I lose 3-4 plants out of 5 in the process. The amount of leaves they drop and the decay they produce in a 65g tank is impressive. Each stem takes up at least 3 sq in and a healty plant outgrows an 18" tall tank in 5 days.
And then you get: Oh, $7.50 in shipping and $1 per plant is ridiculous. Oh, can you overnight them to me for $7.50? Oh, no heat/cold packs? Oh, it will take 3 days?
Just ask in open forum how many times I have not delivered what I prommised and then some.
And even that one will be squared away in time.
And there are 10s or 100s people on TPT who deliver even better.