I have the
FloPur Mark 8000.
Cost is $220 and includes shipping if bought from the site above. Regeneration is done with a box of common table salt.
It is similar to others like the "On-The-Go" water softener which is the one Camping World sells I believe.
Both are 8000 grain units which means they will last longer than those with smaller numbers without requiring regeneration. The 10,000 grain units will last even longer before needing regeneration. Some folks use "Water Sticks" but the biggest one of those I have seen is only 1500 grains.
In AZ where we spent most of the winter the water hardness is about 50 grains per gallon. That means that an 8000 grain unit will soften about 160 gallons before needing to be regenerated. Since we use about 13 gallons of water per day we had to regenerate every 12 days or so.