Hi rjag,
First of all, if you are just looking to buy cheap multi engine time, then come over here. But ask yourself this, do you just want say a hundred or two hundred of multi time to make your total time look better, or do you want to buy 500 or so multi time? Coz if you for example buy 500 hrs and half of this is safety pilot time, then I think its better to just fly a C-152 with no safety pilot time. But if you have little or no multi time at all, then I think it won't hurt to add 200 hrs of multi time, even if half of it is safety pilot time. I myself am a foreign student who came here to get my license and build time, and I have done the 100 hrs multi with half of it safety pilot time. Then I'd either do flight instructing (which by the way is not so lucrative these days given the lack of students) or buy a used C-152 to build total time, which is gonna be more or less the same amount of money you'll spend anyway to buy 500 hrs of multi time, but at least you won't have safety pilot time.