I bought my first Assault back before 2000 at a Roseville (?) CA Auction. It was the first game auctioned and I probably overpaid at the time for around $325. I had to sell it to move back east and have wanted one back for at least 5 years. 4 years ago there was one in NJ for sale for $750 minimum which was crazy high. I've had an ebay search up since then and there have really only been a handful sold in that time and never close by.
The one I just got has black plastic pieces screwed in by the front wear areas and I'm not sure how much damage is under them. And the base sides are hacked off so it's just the skinny cabinet now. I need to wedge it between two other games so it's not too easy to tip over.
Still fun to play! Joysticks are original but pretty worn unfortunately.