The first step is to think about not having a big "funeral". You don't need to do the whole thing, with viewing (which likely isn't possible if their state allows them to skip the embalming process, which lowers the cost and the use of horrid chemicals) and the whole nine yards.
My FIL was Buddhist, and they had nothing involving a funeral home. We found a mausoleum for direct cremation, and that came in at under $900, which included the extremely basic box (necessary) and a very basic urn (we could have provided our own, if we had one...Costco has in the past had a lovely silk-covered square box/urn). An extra $50 for them to take his ashes out onto a boat and scatter his ashes, and the needed permit for that.
MIL had a service a certain amount of time later at her temple; likely cost nowhere near what a funeral home would have cost, and was exactly what she wanted, instead of picking from a catalog of options.
If the man in question wants cremation, and if there are no directly useable crematories in their area/state, there is the Neptune Society, which arranges things at a lower cost than a funeral home would have.
The family could just have a wake of some sort at home, instead of dealing with the funeral home.
All sorts of options, but I'm not sure there will be a way to get the big huge viewing/funeral/service/etc on credit...but they can certainly contact the funeral home society in their area to find out.
Also, there's a Social Security "death benefit". Not much, a couple hundred dollars, but it's something.
Oh also, should it all happen, we found that having 3 certified copies of the death certificate was enough. One for faxing to the companies that would take a fax (most of them), and two for mailing off to the places that needed to have the paper in their hands...they all mail them back of course. AARP suggested something ridiculous like 10 or 12 copies...at $18 apiece (in WA at least) that is a huge cost. The three we got served us well...MIL never missed a pension or social security payment, and got the "death benefit" in weeks. All credit cards and phone, utilities, etc, were taken care of nearly immediately as well. 3 was good for us.