You can go all over the place through Ebay and other locations to save every penny you can comparing shipping etc...
You can also go to Bargain Fittings, a vender here on HBT, and it'll pretty much be a one stop shop for doing up a full keg. He has all the fitting you will need with instructions, including the sight glass and thermo.
I bought some stuff from him recently and it looks great and shipped very fast. I haven't installed it yet but everything I have read from others say they are very happy with his product. Also, very good prices.
As far as the Mash Tun goes, many different manifold or FB options to pick from with a range of costs. Search some MLT or MT pics and threads and you'll be overwhelmed with options.
Bobby_M on this board also has products like you're looking for but is currently low on inventory, great prices. He has some cool calibrating numbers for the sight glass.
Of course you could part it out and go to Mainland Valve on Ebay, or KLG stainless, also on Ebay and get most of what you need. (Bargain fittings bulkheads are much easier, and very reasonably priced).
And don't forget the QD's from proflow dynamics.
Just decide how much bling you want and the sky is the limit.