Who makes the best digital camera in the price range of 150 bucks?

The Canon Powershot A590IS is a good one for that price. You may find it even a little cheaper. It has Image Stabilization, viewfinder and you can manually set the aperture and shutter speed.

You will need a memory card. The internal memory in any camera is very small. You will also need AA rechargeable batteries and a charger.
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I highly recommend the Canon SD1100 IS. Although it doesn’t have onboard camera memory (which is rather inefficient, actually), it’s the best bang-for-your-buck deal out there.

It has 8 megapixels (high image quality), image stabilization (correcting camera shake), and a sharp 2.5" LCD (for accurate picture review). The Lithium-Ion battery holds a long charge from my personal experience.

It’s ultracompact and comes in a variety of body colors. Best of all, it’s priced at $160 on Amazon right now! You can get a cheap 2 GB SD card at many places for about $10. Definitely worth checking out.

Here are sample pictures: http://www.dpreview.com/gallery/canonsd1100is_samples/

Happy Shooting!
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