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SW Iowa | Mouser is another place that keeps a good selection in stock and has decent pricing. http://www.mouser.com
Allied Electronics also used to stock some connector lines that other places didn't. http://www.alliedelec.com
With you being in MN, DigiKey would be my first stop, though. Ground shipping from them could likely be next day for you.
*Usually* most connectors will have part numbers and/or other marks identifying the manufacturer molded into the plastic somewhere. It's often small, so you'll need to look closely. Amphenol and Tyco (now TE Connectivity, I believe) are two of the bigger manufacturers of circular plastic and metal connectors.
Be aware that many industrial connectors have a vast array of different pins/sockets available intended for different wire gauges and signal types with different surface platings. It's not always cut and dried what pin/socket you need for a given connector backshell.
To replace contacts the "right" way requires a ratcheting crimp tool with die set specific to the connector you're working with, which can run $200+ each. With any hand crimp--even using the proper high-dollar crimper--I think reliability is better if you additionally solder after you crimp. If you're going to solder anyway and aren't planning to build/repair harnesses on a daily basis, you may be able to get by with a cheaper universal crimp tool... I've had pretty good luck with this one https://www.amazon.com/gp/product/B00OMM4YUY but it is probably not a good choice if you're working on something with heavier gauge wire.
For soldering, I like Kester 951 no-clean solder and flux pens (their 2331-zx is even better at cutting through oxidation, but requires any residue be cleaned up with water to avoid corrosion). You don't want to glob solder on--just enough to wick into the crimp and displace any air gaps.
If buying from an electronics wholesaler seems more complicated than you want to deal with, somewhere like Sensor 1 may not be a bad choice.
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