Good, Fast, Cheap, pick only two. Which two do you pick?
Depending on what type of poor you are. No that is not an insult to you or anyone almost everyone is a type of poor. Time poor, money poor, space poor, patience poor, local availability poor.
Garage sales and craigslist can be a great way to get quality tools for a low price. HOWEVER if you value your time (time poor) and don't like dealing with difficult folks (patience poor) you will be the furthest behind this way. Unless you somehow luck into purchasing an collection lot at once.
Off the top of my head to get started quickly on a budget
HF 44" bottom box ~$350
Craftsman USA made mechanics tool set includes sockets, wrenches ~$250
depending on # of pieces
Couple things to watch out for. Craftsman has switched most hand tool production to china. I would only buy USA craftsman stuff, for the price I would not pay for Chinese tools. SK, Williams, Proto, Kobalt USA are a few reasonably priced brands of good tools that are often overlooked. Of course the major truck brands like Snap On, Mac, Matco, Cornwell are good, but usually they are sold at a premium price.