Repotting grocery store phalenopsis.

[Floofatiel]

Hi. I haven't dealt with orchids for a while and was wondering where a good affordable place to buy orchid supplies is and what I should repot into. I'm thinking a mix of spaghnum and bark as we have hot summers but I still want them to be able to breathe, though I have though about going all spaghnum. I'm thinking clear plastic pots for the phals so the roots can get light. Only thing with the plastic pots is they fall over every time we get a breeze. They'll be staying outside for the summer. What is something good to weigh the pots down with? Or should I go with clay? As far as the medium should I go with something like orchiata and new Zealand spaghnum or is it okay to stick with the better-gro stuff if I can get it cheaper?
Also I have a latouria dendrobium that seems happy in a claypot with spaghnum but it's been in the same pot for a year. Should I repot it?
Also also, I have a phal with no roots, shriveled leaves and a possibly rotting base. Is it a goner? Any way to save it? I'm thinking clay pot half filled with spaghnum to try to keep humidity around where the roots should grow.