I've been very seriously looking at portals for my upcoming Ultimate Cruiser build.
I also e-mailed Tibus after seeing this and got a price of EUR 10.500 +8 weeks lead tie for a set of the Tibus portals. That CAD$13,753 at today's conversion.
They have two big things going for them.... the will bolt onto a Cruiser Axle, and they are aluminum (lightweight). The 35" tire max size is a deal breaker though. My Dodge tow rig has 36"'s on it, and my Cruiser will never run anything less that 40".
Probably a more realistic option is the AxleTeck Portal. USD$6,499 for all for portal ends. Very strong, they have clients running up to 53" tires with no problems, but have only been stress tested to 55 mph, so speed might be a problem with these. Again, a deal breaker for me, as the Ultimate Cruiser needs to be able to drive on the freeway all day long. The other two big downsides with the Axleteck is that you're stuck with a u-joint steering joint instead of a birfield, unless you can get RCV axle to custom make an axle for this portal.
The other big downside is as a Cruiser guy that these don't bolt up to Cruiser axles, and would require a swap to a Dana or Ford axle. Which is not a terrible thing, but all of a sudden you're back into the $15,000 price range by the time you have a 'built' Dana 60 ready for these portals. They DO, however, have CTIS!
Welcome - AxleTech International Motorsports