Bouchelle Island allows in water storage - trailer parking area and they have their own ramp. Condo living is great for half-timers. I also love Inlet Marina Villas and Diamondhead Point in New Smyrna right on the Indian River (Intracoastal Waterway). Check out all of the details on my condo website http://www.DianaNSB.com 386-690-2300
Elliot's answer is correct, but I would add the City of Oak Hill to your search list. There are several communities in Oak Hill that are directly on the water (river or canal) within your price range. I found a dozen homes that meet your $150,000 budget. As an example "LIghthouse Cove" is a community of Factory built homes on the water.