In standard? There are 6Ls for as cheap as 1C
No, there aren't.
Any 6L you see listed for 1c are being troll-listed by people who have no intentions of ever actually completing the trade, hoping that newbies will not know any better, list their own 6L that cheap, so the troll-lister can snatch it up.
OR they're listing that cheap so they show up when people list their stuff "buyout only" and sort by cheapest price, and have a real price in mind they'll tell you when you try to trade with them.
Both types of people are scum.
The cheapest 6L possible to get is almost always Tabula Rasa, which ranges from 14-30 chaos (corrupted) or up to 1 exalt (uncorrupted), with the +1 gems corruption going for several exalts.
ANY uncorrupted 6L that isn't tabula rasa is worth multiple exalts, minimum. Even if it has shit rolls - you can always dump chaos/scouring/etc into making it have good-enough stats.
The Tempest League distorted the price of corrupted 6L because it flooded them into standard, you can often get corrupted 6L for the price of a Tabula or so. Be aware that changing socket colors is expensive/difficult (requires level 8 vorici and 1 vaal orb per chromatic cost, so at least 4 vaals per color roll).
Any 6L can be vendored for a divine orb, so the price of a 6L HAS to be floored at a Divine (generally 10-20 chaos). Anyone selling a 6L for less than a divine is just throwing away money.