The Astros are currently an MLB worst 25-45 and are in the process of being transferred to a new owner, so they certainly figure to be sellers at the trade deadline. MLB.com's Bill Ladson hears that they are looking to trade both Brett Myers and Jeff Keppinger, two names that have frequented the trade rumor circuit in recent months (Twitter links). Ladson doubts that the Nationals would have interest in either.
Myers might not be very marketable these days. He'll be 31 in August, and he's pitched to a 5.03 ERA with 6.5 K/9 and 3.0 BB/9 in 87 2/3 innings this season. The 18 homers he's allowed are the most in baseball and his fastball velocity has fallen off considerably. Myers will earn $7MM this season and $11MM next season before a $10MM club option ($3MM buyout) for 2013 comes into play.
Keppinger seems like a much more practical trade candidate. He's hitting .301/.329/.370 since coming off the disabled list following a foot injury, and last year he hit a respectable .288/.351/.393 with more walks (51) than strikeouts (34) in 575 plate appearances. Keppinger has plenty of experience at second, third, and short, and his $2.3MM salary is a little easier on the wallet. He is also under team control next year as an arbitration-eligible player.