A cock ring and penis pump. These were originally prescribed by physicians for ED prior to becoming sex toys.
There are a few internet drugstores that are trustworthy and reliable that you can order Viagra or Cialis from. Read all the precautions prior to ordering to make sure they will not harm your husband.
Extenze???? It seems to have a following, but I am completely unfamiliar with the product.
Good luck, try to get hubby to the doctor, there are many serious health issues that could be the actual cause of ED. Not trying to worry you, but care does need to be taken -- at least a physical if he doesn't say anything due to embarrassment.