I can only speak with any experience of biking in Cambodia. I knew a guy who bought one of those crappy old Russian bikes, Minsk, in Vietnam and had no problems riding it into Cambodia. He drove it around here for a year or so on Vietnamese plates and was able to sell it onto a local bike shop, Dara's up on Pochentong Boulevard. It's still sat outside now!
You can buy dirt bikes in PP relatively inexpensively. There was an electric start Suzuki DR350 up for $900 a few weeks ago. Piece of junk though. Mate of mine was interested in it but only prepared to pay significantly lower. Older kick start bikes like the Suzuki DR250 should be less than $1k. Honda XRs are more popular and probably somewhere north of $1500 or over $2k if newer.
If you're into sports bikes, or newer stuff, try the likes of Flying Bikes on St 110 in PP. They've got a couple of Triumph Bonnevilles, a 600cc Ducati (can't remember which model) and lots of large Japanese cruiser bikes. Pricey though. Lots of other places with machines around. Just gotta look when here.
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