Amazon will probably not be the place to get a good price on this. The cartridge is a standard "A1". The first vendor that came up for me using "A1 water filter" is
dyersonline.com for $38.97. The 3M cartridge is marketed as an RV filter and for that reason will likely cost more.
Going by specs, there is nothing unique about this filter. I would contact one of the major online water filter cartridge vendors and see if they can cross-reference it to another quick-change cartridge or perhaps replace all of it with another brand/model.
It could make sense to replace with another type cartridge that is more commonplace and uses a 10" whole house housing. There are a lot of filters with similar specs. to the 3M or better. For example, one that comes to mind is the
Pentek Floplus-10 which is a "combo" filter with carbon block, sediment filtration and a 0.5 micron inner core. This can be found online for $15-20. Another advantage of a 10" cartridge is longer life.
You should have no trouble installing a 10" housing under the kitchen sink. I installed 3 of them under our kitchen sink (TT) at the rear and they don't interfere with use of the shelf space and you can't tell they are there.
A couple of good online filter vendors:
filtersfast.comwaterfilters.net