Based on value of 2 dropdowns, return value from a table?

Sorry, I've searched for this but I'm lost. I tried doing it with nested IF statements, but there are too many for excel to accept.

Basically I have two cells where a user can select options from a dropdown.

Dropdown 1: size (13 options here)
Dropdown 2: tax bracket (3 options here)

Based on their choices, I'd like excel to look up the correct tax amount from a table on another sheet. The table looks something like this:

Please Login or Register  to view this content.

Is there a short and simple way to do this? How would the formula look if Size 1 is cell A1, and the final cell in the sheet is D13 ($9.99)?
Any help is greatly appreciated.

Try:

=INDEX($A$1:$D13,MATCH(X1,$A$1:$A$13,0),MATCH(Y1,$A$1:$D$1,0))

where X1 and Y1 hold the inputted Size and Bracket, respectively.