According to the 6th edition of "A Guide Book of United States Paper Money" (The Official Red Book), if it was in EF condition, it would be worth $15, or $35 in Uncirculated 63 condition. Collectors know that the published prices don't necessarily equal what you end up paying.
That is RETAIL. I don't think your bill is in EF condition, though. If it was mine, I'd keep it and not spend it.
-- Tom