Hah, my first attempt at aob. I think they work, but use at your own risk. ^^
no cost tiling
96 07 00 08 00 07 32 00 00 00 ->
96 07 00 08 00 07 00 00 00 00
(no idea what'll happen when you get tile-cost bonus talents, tile cost might go negative, too lazy to search for the actual place where the cost is subtracted so I just went for the basic cost instead)
no cost for units
96 08 00 04 01 08 91 04 01 08 91 4e 96 03 00 09 13 01 1c 0b 4f ->
02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02
OR
96 08 00 04 01 08 91 04 01 08 91 4e 96 05 00 07 00 00 00 0b 4f
(they both seem to work, first version removes the entire gold cost statement, second version changes the cost to 0 in a not 100% a-ok way, but it seems to work anyway, take care, the cost is still added to the score even though it isn't subtracted from your gold pile in both versions, so don't go too crazy, I could write one more to make it so it doesn't do that, but don't see the use just yet)
The research was quite interesting, the hardest part seemed to be that I couldn't make head or tail of the code until I found out the darn thing had some sort of encryption going. Once that's out of the way, editing the code is easy as pi (or so it would seem). Enjoy! XD