How do you deal with constant undercutting?

[KageTokage]

There's a certain individual on my server who as long as they aren't AFK, seems to check all of their wares (They're selling one of seemingly every single ilvl 350 DoW/H item), then undercuts the lowest price on the MB by one gil if they aren't the cheapest on the market about every five minutes or so.

They do this for several hours a day, so I'm constantly under pressure to keep changing my prices to get my stuff to sell.

I'm feeling rather convinced at this point that they're running some sort of bot, but the STF obviously isn't going to do anything about it, so it feels like the only way I can get my stuff to sell is by selling my items at enough of a markdown that it makes people want to snatch it up ASAP, but that's obviously hurting my potential profits.

Not really sure if this belongs here, but I figure others who are into crafting would have the best idea of how to handle it.