With very casual dress, I use the Safepacker by Wilderness Tactical Products. http://www.thewilderness.com
Turns out that the 239 will also nicely fit holsters for the 229.
Galco makes about 22 holsters for the 239. I like the Side Snap Scabbard for a belt holster and the Sky Ops for an inside the waistband. There is a link to their online catalog at the top of the page.
"Patriotism is supporting your country all the time, and your government when it deserves it." -Mark Twain
I recently purchased a Galco "Summer Comfort" for my P239. I'm left-handed. It's a right-handed model, which works great for left-handed carry over the left kidney. Kindof a SOB IWB carry - which sounds weird but works great.