Yes! Yes! I too have the problem! I kept getting flat tires, thinking it was the tire. I even took out a service warrantee on new tires at Sears, to which they tried fixing the flattened tires on several occasions. But then on about the 6th time in the shop, one of the guys found small, almost pinpoint sized rust holes on the inside lip of the rim. Finally, we found the culprit... the rim was leaking, not the tire.
Anyway, it has now been almost a year that I have been driving with my ugly spare rim, because I can't find a used one to match it. The rims are the 5 spoke/star Chrome, on a 1997 ES300. The cost of a new rim is over $650, which we really don't want to spend the money for if we can find a used one. But I'm now getting desperate. I'm told that any chrome rims for that Lexus year, were NOT factory, that the dealers had it added on. Apparently, it's nearly impossible to find a replacement.