FSBO advice for waterfront lots

[Glenn R.]

I have a number of waterfront lots that are in a highly developed area of Lake Norman, near Charlotte, NC. Since the remaining vacant lots are becoming rare here I've decided to offer them FSBO. There aren't a lot of details involved with building lots like there are with houses, so it seems hard to justify paying a commission.

I placed FSBO signs & info box at the lots and on the main roads in the neighborhood (only allowed Friday afternoon until Sunday evening). Shared the surveys & info with a lot of local agents & builders. Posted them on Zillow, Craigslist, and Nextdoor.

Initial interest has been very high.  What other types of advertising should I try?

Btw, I just spoke to a builder that claims to be building 11 homes around the lake right now and has 10+ couples shopping for lots now.  He's asking for a discount, asked if I'm concerned about devaluing the market by offering 7 high-end lots (at two different locations) at the same time.  He also mentioned partnering with me, he'd build on our lots & we'd split the profit.  (I listened to a similar pitch from a different builder yesterday.)  

It seems like they're confirming that the market is hot, which tells me to just sit tight and be patient. 

I'm just wondering if there are any other effective, free or low cost, ways I should advertise?

Thanks,