Really, you've already got your own answers. Unless you can shop online, army surplus and charity/thrift shops are the only place you are going to get yourself some good deals.
Unless you want to learn to sew of course.
For a good spring start, get yourself a nice pair of boots and a jacket you are happy with. You've already got the goggles, it's all you need for the start of a wardrobe really.
Alot of work wear can at times be quite dieselish or steamy, just look at Doctor Steel's advice on how to make your own toy soldier uniform!
Check it!