the guide I use says $180 to $400 depending on condition. Best bet is to go to a sight like Gunbroker and see what they're selling for and in what condition.
Depending on overall condition of your rifle,the marlin model 336 are ranging in value between 150-350 dollars.
The Marlin model 336 will sell for between 200-350 dollars,depending on overall condition.
By including the serial number in your question,we will be able to answer when your Marlin model 336 was produced.
Model variation
$350.00 to 500.00 depending on condition
the cost 3030 cal 336sc
100-450 USD
The R prefix to your serial number indicates that your Marlin model 336 rifle was produced between 1957-1958.
The value of a Marlin model 336 in that condition is 350-400 dollars.
Your Marlin model 336 RC(regular Carbine) will range in price from 250-350 dollars depending on overall condition,and a good bore.
Your Marlin model 336 was produced in 1976.
300-500 USD
Your Marlin model 336RC(regular Carbine) was made in the year 1966 with the 2 letter prefix of AB to your serial number.