I have the opportunity to purchase a good condition SP 89 with four of the stick magazines. 2800 flat. Is this too good a price to pass up? It's a 1990 preban model. I'm just not sure if the value is there on these anymore with the introduction of the clones and the Sp5k. Any advice?

I've seen them go for more. That said, you'd have to want it over the modern version but for collectibility, it likely won't drop in price ever.

What do you mean by 'good'?
There are NRA standards for grading firearms and NRA 'good' is really not very good.
I have an original SP89 in the box, my understanding is the new model is not much different so I see no collectability on the SP89. Buy a new one from HK.-Richard
BTW what typw of mags come with the SP89, HK mags or Pakistan?

They come with factory HK straight mags, referred to as stick mags I believe .

I think they still trade in that range, but I guarantee you that the quality foreign clones have diluted that market a whole lot. There are people that will want one, but people that just want an MP-5 have cheaper options. It's hard to see such a thing losing value, but it's a lot of cash to tie up in one.

If you just want an MP-5, spend $1600 on a Zenith.

They go for about $3500-4000 if they are stock and undamaged. I sold one recently for $6400 that had a new tri-lug barrel, the paddle release and remarked MP5K.

As long as it's undamaged and the bolt is within tolerance, it's a very good price.