The Russian interferon alfa injections are incredibly cheap compared to Western interferon alfa. When Dr Chia gives ME/CFS patients 3M IU of interferon alfa three times a week, he says the monthly cost is around $6000. So that's about $500 for one injectable 3M IU dose.
Yet Cherry pharmacy sell a 5M IU injectable dose for about $10 !
In any case, whether using Western or Russian interferon injections, after some time (many months), the body usually starts to make antibodies which target and disable the injected interferon, so it will stop working.
But if you use the suppository route of administration (and I expect the intranasal too), you do not get this antibody issue.
So if you are trying interferon injections, you may want to take that for a limited time (eg, 2 or 3 months), in order to try to avoid the creation of antibodies; and then if there are any benefits for your ME/CFS, you could switch to interferon suppositories/intranasal using maintenance doses.
I actually wrote to Dr Chia to explain this strategy that I thought of (though I am not sure if he understood the idea behind it). For enterovirus ME/CFS patients, Dr Chia found interferon injections very effective, allowing over 50% of bedbound ME/CFS patients to return to work after treatment. But these patients tended to relapse after around 4 months to a year (the relapse was often triggered by a bout of heavy exertion), most likely because the virus was not fully eliminated by the interferon, and so eventually returned.
So my idea is to take the normal 2 or 3 month course of injectable interferon that Dr Chia uses, and once patients have greatly improved, to switch to taking low doses of interferon suppositories for maintenance.
The idea is that once in remission, if you continue to take low doses of interferon as a suppository indefinitely, that may prevent the virus from returning. But most importantly, the suppository administration would allow long-term low-dose interferon use without the antibody issue occurring.
Dr Chia now uses interferon beta for enterovirus ME/CFS, but I have not seen any cheap interferon beta available.