I called several vet offices before I found one that sold them by the eaches. No one else sells here that I found but a vets. I was like you, my Civvie Slappy just stopped eating and I needed something fast... I tried all of the other tricks, and she would have no part of it. I finally had someone from this forum that was in my area come over and help me burrito wrap her and we used a dropper as I could not get the syringe thingy to work. I had help for almost a full week. We would blend babyfood - meat only with some tuna water and use a dropper. That is the ONLY thing I could find that would help. Then after that, I used the fora flora to intice... It worked.
Main thing, he must eat even if you have to help. I found that the 'magic bullet' worked the best for pureeing the food enough for the dropper. I found the bullet thru craigslist.
Keep us posted as to his condition - sending 'lets eat' vibes your way!