If a home was sold at a trustee sale and is on the market again, you can purchase the home. There is no legal time frame that you have to wait to purchase this home.
If the house is for sale, you should be able to buy it. If the house isn't on the market quite yet (although it sounds like it is), you could contact the foreclosing law firm to see if you could put in an offer to purchase. It's unlikely that would be accepted, but I've seen people try that. Typically, though, if the bank has already completed the foreclosure (or most of it), it wants to get the property on the market to see what it could get on the open-market.
This response is not intended to create an attorney-client privilege and is based only on the facts which have been presented on this forum.
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