[From: firstname.lastname@example.org (Gary Newman)]
Once you've decided you want a computer that supports parity error detection, you will find that nearly all mainstream mail order systems are not available with it. Here are a few approaches that work.
Buy a corporate or server system advertised with parity support. Dell Optiplex, HP Vectra, and others are available, but usually at a "corporate" priced premium of $600 or so.
Buy from a local system builder who will provide parity support.
Purchase a system with parity support but without parity SIMMs. All intel Neptune based P5 computers have such support. Then swap out the non-parity SIMMs after replacing them with parity simms you purchased from one of the many memory vendors. Then the non-parity SIMMs can be either sold to vendors who resell, or put in a game system you may have hanging around.