The other question is what do you have for crimping tools? Larger lugs require a heavy duty crimper, I use a hydraulic one that does a nice job on larger cable lugs and a few other crimpers for different styles. It does no good to buy a bunch on terminals with no way to crimp them properly.
For larger lugs and wire this is the best place I have found, always top quality pure US made wire and high quality lugs. I buy my 1/0 battery cable from here, great fine strand stuff.
Purchase Gxl, Txl, Sxl and Sgx Automotive wire Buy it By the Foot.
www.acdcwireandsupply.com
For all sorts of connectors, lugs and other bits and pieces like resistors, this is the place for high quality. If you need a big UK made fan resistor that will last a lifetime this is the place.
Another source for terminals, pieces.
skycraftsurplus.com
Some tools...
Jokari 20050 Ergonomic Super 4 Plus Automatic Wire Stripper for Wires from 0.2mm-6mm, 16.5cm L x 14cm W x 2.7cm H: Amazon.com: Tools & Home Improvement
www.amazon.com
Best one so far for heat shrink terminals. Knipex quality.
9-1/2" Crimping Pliers, Ergonomic Grip: Amazon.com: Tools & Home Improvement
www.amazon.com
Good quality and works well.
Astro Pneumatic Tool 9477 7-Piece Professional Quick Interchangeable Ratchet Crimping Tool Set - Molex Crimping Tool - Amazon.com
www.amazon.com
Decent cable cutter that holds up cutting larger battery cables.
Cable Cutter, Shear Cut, 9-1/2 In - Wire Cutters - Amazon.com
www.amazon.com
Heavy crimper, hydraulic. Not for everyday commercial use duty but good enough for DIY use, good company name and warranty.
TEMCo Industrial Hydraulic Cable Lug Crimper TH0005 V2.0 (11 US TON) 10 AWG to 600 MCM Electrical Terminal Cable Wire Tool Kit with 32 Die Sets - - Amazon.com
www.amazon.com
Battery cable and larger stripper.
Arolax Round Cable Stripping Tool – With Adjustable Cutting Depth – For Circumferential, Longitudinal, and Window stripping – 3/16" to 1" Diameter. - - Amazon.com
www.amazon.com
There are many other tools for different connectors like Delphi and Deutsch, for automotive use use only tinned terminals, ground strap braid cable and lugs not plain copper.
There are also solder lugs with the slit in the front, these are best crimped then soldered.
Heat shrink crimp terminals are excellent for automotive use and are much better than standard nylon non shrink types.
Hope this gives you and the other members some ideas. There are many other companies that sell supplies and more tools are available, this post is not intended to include the only ones or the best of them