You'd need to list your requirements. $150 limits your options, especially if you're looking for a camera with optical zoom. I've got a Foscam FI9821W V2 that I'm happy with, and you can grab one for $69 on Groupon (just search for 'Foscam'), but it doesn't have optical zoom. I bought 3rd party lenses to swap out the original one with.
Foscam's FI9826W is around your price point, and does include optical zoom. I have no experience with that particular model, but have seen others on Neptune's forum who run them with success.
I can view my tank from my iPhone using my Apex Fusion dashboard (Safari browser only, no Chrome), as well as my free "CamViewer" app.