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Your serial number indicates that your Marlin model 782 was made in the year 1977.
Your serial number indicates that your model 782 rifle was made in the year 1981.
The Marlin 99 was a low-priced utility rifle made only from 1959-1961 and it has not much collector value. Today they sell for under $100 and Micro groove is no longer used by Marlin because it wore out too quickly. It was used to lessen production time and cost.
Double check that model number, I believe it actually reads 336CS. The Marlin 336 in most of its variants is valued as a shooter, in the $150-$225 range. sales@countrygunsmith.net
Check the barrel and receiver.
Check the frame and barrel.
how much does it cost a 1983 marlin 38-55 hex barrel?
Look on the barrel and receiver.
85 years
Your serial number indicates the year 1987.
go to: Marlinfirearms.com and pose the question to them