Newegg offers iolo System Mechanic with System Shield for $20. Redeem this $20 mail-in rebate to drop it to $0. With $1.99 for shipping, that's the lowest total price we could find by $14, although we saw it for $2 less last month. This software can be installed on up to three computers and performs many operations including memory optimization, hard drive clean-up and acceleration, and security tune-ups.