So there are a million different options and approaches to getting more protein via powders. There are two primary types:
Whey Protein - Fast acting, take immediately after a workout / run / gym. Protein
powder will not create muscle (common fear) but will actually help tone
and lean existing muscle. Will not make you bulky at all. The best
price / performance ration for Whey Protein is ON's 100% Whey.
Casein Protein - Longer releasing, ideal for breakfast shake or evening drink. Slowly releases, allowing body to absorb protein over several hours. Lots of options, I prefer Optimum Nutrition brand here as well.
Both products above are milk based. There is also a new all-veggie protein powder called Raw Protein, available at Whole Foods. Pretty expensive, but entirely plant based. I have not experimented with plant based proteins yet.
In addition to straight protein powders, there are also blends. A mixture of protein,
amino acids, vitamins, minerals, etc. A little more expensive, think
of them as "designer proteins" I really like this product and take
some every morning and evening - Syntha6.
Stay aware from the protein powders sold at supermarkets like Walmart, etc. They are very cheaply made.
You can of course also buy premixed shakes, protein bars, etc. I used to buy these, but they are over-processed and contain to much sugar.
good idea to consult your doctor first about what is best for your