Managing HTML Tabular Data with MySQL WordPress Integration

Here is my problem.
I want to be able to manage multiple data values presented within a several HTML tables throughout multiple posts in an easily accessible single location, that can be compared with a EXCEL spreadsheet for simple data entry and comparison. If that is not possible I would like to manage multiple table values within a single post using meta data or some other WordPress sanctioned MySQL tie-in.

Does such a WordPress or otherwise compatible plugin exist, or does anyone have any reasonable ideas about completing such a task using only WordPress’s Custom Field functionality?

In this particular instance the data I will be managing is prices for custom furniture built using a large variety of woods with several user configurable options. None of the e-commerce packages for WordPress seem to scale for this many prices, and although I don;t need a shopping cart I have looked almost everywhere for even the most trivial database integration. I think that in the end I might need to customize tis feature set for myself but wanted to know if anyone had any ideas about this sort of thing or the use of custom fields to complete such a task?

Thanks again for taking a look at my problem and for any answers you might be able to provide. I know this isn’t a blog sort of thing but WordPress is just so adaptable, I hope I am not stretching it’s limits.