Google "organic pest control". GW doesn't allow most of the links. Green methods is one.

As a rule spending your money buying Lady Beetles is a waste, all you need to do is create conditions that attract them into your garden. Planting plants with flat flower heads, such as dill, can help feed them in the abscence of other prey. Not spraying poisons, that kill off the beneficial insects as well as the pests, also helps keep them around.
Aphids, as a rule, prefer to feed on lush green growth usually the type of plant growth that appears when an excess amount of Nitrogen has been applied. Knocking Aphids off plants is fairly simple with a sharp stream of water.

I forgot to attach this link.

Here is a link that might be useful: About Lady Beetles

You can check out organiccontrol.com. They have lots of different types of "good" bugs, including lady bugs.