Buying tools one at a time is not the way to go, unless you want to go to the poorhouse. I suspect that the best deals that you are going to find are on the larger Craftsman mechanics tool sets. Sears always seems to have a few sets on sale. And joining the (free) Craftsman Club will get you access to additional sales.

Of course, no set is going to have everything you need, but buying the biggest set that you reasonably need is the most economical option in the long run.

Husky seems to be about the same level of quality as Craftsman, but they offer nowhere near the selection that Craftsman does.