You can get the latest type sealed connectors...the type used on modern cars that make them so much more reliable than our old ones, through one of the national electronics suppliers. I have Allied and Mouser, which are local to DFW, but are so easy to mail order that I usually don't even drive to them. Mouser, especially, will get the order out same day and have it my door the next.
The downside...there are so many styles, with so many numbers of wires, with so many power ratings...it takes a good amount of time googling through their catalogues to find the style and size you want. Bosch has one of the best lines of sealed connectors, but tricky to navigate. They usually come with male and female separate...so finding the matching pair takes a while. Help, like Radio Shack used to give, is practically non-existent, so plan on taking an hour to find a good connector pairing.
The spade connectors, shown above, are convenient and available, like everywhere. They are on the bottom of my list for reliability, though. Our family '67 VW Bug used nothing but spades...on the entire car. After the car passed 10 years old (like, when I started driving it at age 16!) you could never get in it without something electrical acting up. It was never the component, but rather the crappy spade connectors. Wiggle, jiggle around and the component would start working, but OMG what a pain!! I still use spades, chiefly because they are often all you can get at parts stores and Lowes, but avoid them whenever I have time to order an alternative. VW broke me!