Kid_ Kirby,
Welcome to Treasure Net !!
There were +/- 50 different 1934 $500 bills; 1934 plain and Series A. (A few Series B and C bills were printed but never issued to the public.) The value (cost) of the bill is more dependent on its condition versus it's relative rarity.
A few years ago, the Red Book (retail values) noted the St. Louis plain (star note) had the highest value: $6,500. In EF-40 all the bills had a retail value of at least $1,000. Today's value (prices realized) may be more defined by going to Ebay and looking at "Completed Transactions".
Don.......