Welcome back RoadDad. Sorry to hear of your extended search. May be my imagination, but complete looking Plus 2's do seem to be coming up less frequently in the US and Canada. I did rather like this one in Texas from a while ago, but I believe it is now sold.
elan-for-sale-f2/1970-elan-federal-lhd-houston-usa-t21535.htmlPerhaps you can you provide some info on the type of project/car you are hoping for, say from the following general broad categories? Someone may know of something local, as a lot of stalled projects only get listed in club newsletters, etc. rather than FleaBay.
trailer project / parts collection
complete but not running
running but needs attention
ready to go and sorted
There was a Plus 2 project available in my area last year, but I don't know if it sold or not.
When I was looking a while ago, I tried all of the Lotus clubs newsletters I could find on line. Seemed to be more cars available a few years ago for sure, but can be a good source in your search. More importantly, a regular lister may know of an available car it their area, as I notice a lot of the clubs aren't posting current newsletters with classified sections any more.
HTH and good luck!