Oops! Sorry, I forgot to reply to your mention of tags and the Solspace module. I have had the tag module bookmarked since my first considerations of EE (and may have already downloaded it). Thank you for adding it to this discussion. I have not installed the module, but think that this may be a good solution to consider. At first blush it seemed like a lot of tool for something so simple as selecting one of 4 or 5 small price tables, but it may be just the ticket.
Prior to doing this stuff I was more comfortable with relational database design (at a modest level), and I swear that gets in the way quite often for me when working in a controlled CMS. Just need more time and study.
I’ll see if the tag module will work for this before my content gets much deeper and causes me a lot of work to update all of the records, err, I mean entries.