I mention the "September rush" because in September, traditionally the land business gets much busier and it will be less likely that you will find affordable and available waterfront parcels.
There are both residential and commercial waterfront parcels available now, for only L$3700 per month with no extra fees at all.
Consult this page for listings: http://ecstasyrealty.com
As always, click on View and turn on Property Lines and Land Owners to see the available orange-colored parcels.