Well HTML is disabled for non-staff for obvious security reasons. The way it's been done in the past by some members is to just use a fixed-width font such as Courier.
Example:
Dollars Cents
123 89
I'll tell ya what though. I'm enabling table bbcode right now. Here's hoping I don't end up regretting it.
Example:
Code:
cell 1 | cell 2
cell 3 this is a long one | cell 4 here
There's no real styling to speak of, so you'll prolly wanna use colors and other formatting for clarity. Stick manual spaces at the end of things if you find the cells are too close to each other and hard to read.