One of the issues is that the ICF's are just starting to hit retail(Menards dot com lists fox blocks). Most are still only dealt whole-sale thru distributors and the end price you get will probably be a factor of how many you order. For Fox, I think I paid around $18 for 8" straights about a year ago. I am in WA and those blocks came out of the Idaho plant. I will have to look at my paperwork to confirm that. The Menards website currently lists 8" straights for $23.98. For Fox in the Northwest, have you called Cal Portland? They were great to deal with and wound up being 1 stop shopping for a few items I needed. We had one 54' trailer and one flatbed delivery truck, and they managed to get the rebar and waterproofing materials on that flatbed which economized the shipping. Plus their rebar bid beat my local sources...
We are doing 2000 SQ/Ft rectangle(6") over a full daylight basement(8"). In fact we are pouring the main floor(6") wall tomorrow

I don't have any real gripes with Fox. The blocks and ties themselves are pretty tough and appear to take the CC without a hint of failure. the markings on the blocks make hand cutting layout easy(did some mitered corners to save on excess corners ordered), they run thru the table saw fairly easily. I like the large interlocking teeth as they are easy to clean out prior to stacking the next course. The CC guy I am using has been using them and Arxx before fox bought them out without any issues for quite a while now. The fox clips are very cool and very fast for tying things together both vertically and horizontally. My grandson and I could stack and tie a 180' course including rebar in about an hour... I did a 12' arched garage doorway and easily clipped it all together on the ground and lifted the whole archway into place as one assembly. IF you should make a mistake, you simply pop the clips out and pull the block back apart as fast as it went together. Way easier than using tie wire IMO...
Good luck with our project.
EDIT: $18 per 8" straight block. The @23 I mentioned was for one of the corbels I ordered...