Another option is to make your own. I used #1 marine cable from eBay with fusion cable lugs, which is good for245 amps outside the engine compartment. The fusion lugs don't require any special tools. You can buy a tool for crimp lugs but a good tool is expensive and I knew I probably wouldn't use it again for years. The cheap tools give you a sketchy connection so you get what you pay for. I got the fusion lugs and heat shrink tubing from here:
Lug Linky
There are two kinds of lugs that don't require a crimping tool, compression and solder. I've used both and I like the solder connections the best. Here's a video on how to solder the fusion lugs on, it really is as easy as it looks in the video.
Youtube Fusion Linky
Here's a picture of a cable I made to go between the two 6V batteries in the Boxcar. I color coded the ends to show the positive and negative sides of the battery (yeah, I'm kind of anal about wiring)
Bruce
P.S. Here's a link torecommended wire size for inverters.