I am so sorry for your loss Jazza - unfortunately it is not uncommon for this to happen in rodent farm bred hamsters from pet stores
Where are you located generally? You need to fully sterilise the whole cage and accessories set up and leave it at least 3 weeks to ensure all bugs have gone. If it can go in the sun all the better. Throw out wooden items / food / bedding and water bottle and start afresh with those.
We may be able to trace a breeder near you who can possibly have a healthy baby for you. If not I would suggest looking at one of the online sites where at least the babies have been raised in a home situation as at least these have more of a chance of being settled and handled.