Where can I find merchants that sell my level gear?

[Urthdigger]

Honestly any gear you find from a merchant is going to be the same gear players can craft. You'll likely be able to find it CHEAPER on the marketboards, as well as high-quality versions (slightly higher stats, on par with dungeon drops of the same item level)

[Niwashi]

Honestly any gear you find from a merchant is going to be the same gear players can craft. You'll likely be able to find it CHEAPER on the marketboards

Sometimes that's the case, and I do agree you should check the Market Board, but its listings are quite variable. Something that costs a couple thousand gil from a vendor might be available one day for only a couple hundred on the MB, but another day the MB listings might start at ten or twelve thousand, or might not be available at all. Vendors are the fallback when the MB either doesn't have what you want or only has it at ridiculously high prices. (And knowing what vendors would charge for it helps identify what qualifies as "ridiculously high prices".)

Oh, this variability means that while leveling up it's also a good idea to check the MB for stuff you can't use yet but will be able to within a few levels. If you find a particularly good deal on something you're going to want later, pick it up while you can. By the time you need it, it might not be available or might cost a lot more.

as well as high-quality versions (slightly higher stats, on par with dungeon drops of the same item level)

This is the the other big reason for checking the MB. Vendors only sell normal quality, so if a HQ version is available and affordable on the MB, it beats out anything else you can buy. (And sometimes you'll find HQ items for not much more than the NQ ones cost.) This is a particularly significant benefit for weapons, given how important their Damage stat is to your effectiveness, and for the major left side armour like chest and leg pieces. (For some of the jewelry pieces, on the other hand, the difference between NQ and HQ versions can be pretty negligible.)

[monochromicorn]

CHEAPER)

I LOL'd at this, most of those items are way overpriced on mb, even nq. I made my first 100k (not a lot, but when you make a profit of 1k or so, it can take a bit) relisting this stuff. After you hut 25, most people don't know where or don't care to find out where the items are sold, so the buy from the mb, even nq, for quite a bit more than the item is even worth.

Going g to the mb for leveling gear is the worst idea ever, I do not support it.

As was stated, go to where you find mobs at similar levels as you, go to the town, and if there's a leve meet and a merchant, they will sell you level appropriate gear.