I was too young in 1989 to own one but I recall that they was $2000 back then. I think that gun was around $700 to $1000 in 1988 and then Bush signed the EO on the importation of firearms.
Like I said, I was too young but I think that Polytechs, Valmet, Steyr Augs, FNCs were cheap in 1988 and easily had. I would wait in anticipation for an older brother to come home late sunday night to see what he picked up or trade for at the Fort Worth, Dallas Market Hall, or OKC gun shows. Good times to say the least.
I think those memories have shaped my buying habits and is the main reason that I don't sell stuff even when I can double my money. One of my older brothers still talks about that FNC and SP89 that he sold off because he double his money. The thing is, he still wishes he owned both and regrets selling them and a whole host of other things.