I missed seeing this earlier. There are a couple of places near Manchester I recommend.
The first one is ESS. It has a wide range of components, assembly tools, cables, case fans, project boxes and much more. It also has used test equipment and some military surplus.
It can be found at http://www.esssurplus.com/
ESS
900 Candia Road
Manchester, NH 03109
Phone: (603) 624-9600
Fax: (603) 624-9700
Hours: 9:30am – 5:30pm (EST) Mon-Sat
The second one is PAR Electronics at
250 Commercial Street # 904
Manchester, NH 03101
Phone: (603) 623-2009
Once you find the building you go around back on the right side near the river and it is the first door on the rear by the loading dock. This place is packed, it is cavernous, and unbelievable. Peter does not have a web site and sells a lot on eBay. He has a very wide range of “electronics”. There are shelves to the high ceiling of test equipment of every type and vintage, microwave devices, used but nice METCAL soldering irons, cables and connectors of every type. If you need a WW2 X band radar pedestal with dish, or a 100 watt S-band TWTA you will likely find it there.