If I remember right it was almost $3k...but that included that blazing fast 300bps Hayes modem for wide-area networking.
And my mind was truly blown when we replaced the 2nd floppy with a more-memory-then-we-will-EVER-need 20MB hard drive...what could we do with all those bits??
Wow, I admire the far-sightedness of your parents, to give a child a computer at such a young age (and in those early days of PCs).
I was of a similar age when my dad brought home an NEC PC 9801 - with an 8086 CPU (8MHz), 640KB RAM, kanji (~3000 characters) font ROM, even a Japanese word processor. I think it ran MS-DOS 2~3.
"In 1987, NEC announced one million PC-98s were shipped."
That was a big wave, and I'm so glad my parents let me play with a computer as a "toy" - it was a huge influence on my mental development.
Kinda like the monolith moment in 2001: A Space Odyssey. :)
My friends around that age all had a wildly popular video game console called Nintendo "Fami-Com". https://en.wikipedia.org/wiki/Nintendo_Entertainment_System
My parents refused to buy it, and instead let me play with the PC-98, where I learned BASIC, Turbo Pascal, even some 8086 assembly language.
I suppose if I have children, I'd discourage mobile phones/apps and instead give them Raspberry Pi, microcomputers, sensors, devices they can build stuff with.