What is the approx value of a Winchester Model 94 in 30-30 Serial 2289843 in good condition?

According to "The Blue Book of Gun Values" your rifle was manufactured in 1956. The Blue Book values your gun in the range of $130 to $160 for a gun in 60% to 80% of new condition for the standard mod. 94. There are a few collector models but from what you ask, yours sounds like the standard run 94. You may be able to obtain a higher selling price but price is determined by the buyer. See the related question concerning the value of a Model 94 >>>>