Walmart offers the SentrySafe Waterproof Fire-Safe Security File, model no. HD4100, for $39.97. Opt for free in-store pickup to avoid the $4.97 shipping charge. That's tied with our mention from last March and $40 below the lowest total shipped price we could find. It features a key lock, ETL-verified waterproofing, and UL classification for 30 minutes of fire protection up to 1550 degrees F.