Here's a list I had but it's probably a year old.
Order online:
liherbals.com, motarkbest.com, socalherbalremedies.com, preciousmitre.com, herbal-rva.com,
gardenofedenherbals.com, ethnogardens.com, canopybotanicals.com, herbaldom.com, herbal-salvation.com, kra-mart.myshopify.com
Forums:
kratomconnoisseurs.com, thekratomforum.com,
kratomassociation.com, https://www.drugs-forum.com/forum/forumdisplay.php?f=76
Some internet opinions about effects (probably highly debatable):
green - energy, focus, pain, stress, anxiety, for daytime-work
white - energy, stimulating, euphoric, mood, caffeine replacement
red - relaxing, chronic pain, sleep
yellow - stimulant, pain, calm (like a balance of green & red)
gold - anxiety, pain