The Marlin 989M2 .22 caliber semiautomatic rifle was made from 1965-78. It was originally sold with a seven round box magazine (what some people call a clip) but the modern (written in 2012) Marlin brand 10 round or 7 round nickel magazines work fine in the 989M2. As extra information be aware that a "twin" of the 989M2 was made with a tubular magazine, holding nine rounds, and that twin is the 99M1 made from 1964-78. These two Marlin rifles are nicely made models with walnut stocks and handguards. They were made to look like the M-1 Carbine military rifle.
Try e-gunparts.com
Your Marlin model 989 which was a semi auto promotional model will range in price from 75-150 dollar,depending on overall condition.
Try a thorough cleaning, change magazines, change ammunition. The marlin 989 was made in the 60's the bolt does not open when the last shot is fired
try Numrich Gun Parts Corp.If they do not have one,maybe Marlin itself may have a few still in stock.E-bay would be another good place to find a stock for your rifle.
50-125 USD
try eBay that might do .
The Marlin 929 M2 was manufactured from 1995 to 2002. This semi-automatic rifle was known for its accuracy and reliability, making it a popular choice among firearm enthusiasts. After 2002, it was discontinued, but it remains a sought-after model among collectors.
Contact Marlin customer service through their website, and request an owner's manual for your rifle. They are free.
On the main Marlin Firearms website, there is a section labeled "Owners Manuals", from which you can download the manuals of Marlin products in .pdf form. Assembly and disassembly instructions should be included in these manuals. See related link.
I have used the 10-round magazine for the Marlin 795 sold by Brownells (www.brownells.com) as 550-000-337. This is a nickel plated mag. Aside from extra capacity and nickel plating it appears to be the same design as the 7-round magazine that came with the rifle (Marlin 989). Brownells also sells a 7-round blued mag as 550-707-346 that should work.
I'm not sure what they are worth now, but I bought one a few years back for around a hundred bucks..
Could you be asking about the model 989m2?If so these were made in 1966 and are going for between 75-150 dollars.This was a promotional model semi-auto .22cal rifle.