Neat. 3MB would have been insane. That year, my family bought the 512KB trapdoor expansion for A500, so that we could play Monkey Island. It was every bit worth it!
Of course, the extra 512KB made our Amiga that much more useful, and eventually we did the solder-jumper change to make it chip, as our A500 is a rev6 with the 1MB ECS Agnus.
I still have this A500; now it also has 8mb fast on cpu slot, an ECS denise and a 68010.