Depends on what you consider low price. Handheld AIS transceivers that float are kind of over-kill. AIS relates to the vessel, not the person. You can get a dash mount unit for $300. That’s pretty low cost.
If you’re looking at for example large screen displays, yes, marine-rated costs way more. This is because they’re mostly being used in open bow vessels that get rained on and splashed constantly. If you have a nice, warm, dry pilot house, there’s no need to go marine grade for a chart plotter. What you do need is a bullet-proof implementation that doesn’t crash from software glitches, when transferring data among various systems like GPS, AIS, and chart plotting.