It's Actually the "Classic comm" venders. You can get to them on a low level toon. But you will not be able to earn the commendations.
These venders are found in any of the daily mission areas. When you hit level 50 a few automatic missions will show up either on your mission list - or in the endgame PvE mission terminals that will point you to those areas.
So if it's not something I should be concerned about till 50, why are there vendors in places (I.E. Coruscant - sorry if I murder the spelling of that world!)
for lower level players with items for sale marketed to said lower levels?
Sorry, this is a bit confusing for me. When looking at the items in the store, it shows tiny little icons in the lower right signifying how much it costs - the problem is, hovering your mouse over these little icons doesn't tell you what they are. So you're left guessing (if you aren't already familiar with them)
what in the world you need to buy the gear.