I'd recommend supporting hobbyists, then your LFS
, then online stores. That is the way I normally go about sourcing plants. Check our classifieds section first, post a wanted ad in there and mention you would prefer local pickup. You could also post on craigslist for your town.
TPT and APC are excellent resources and 9 times out of 10 the quality of the plants will be 10x better than the LFS
. I have never paid more than $12 for shipping plants. That included a heatpack and styrofoam in the winter.
Keep in mind, they have cold packs that can be used in the summer to keep the plants from cooking in the bags. I've used both heat and cold packs and never had any issues.
One time I got a plant from a guy that forgot to put the cold pack in for me, it looked like tea when I got it, leaves were mush. He did the right thing and sent me another batch for free though. That's the beauty of dealing with hobbyists, they aren't in it for the money. They are in it for the benefit of others and the hobby in general.