If you have a large cyst, the long term consequences can potentially be quite serious and depending on the location western surgical procedures (i.e. a shunt) may or may not be helpful/feasible. If you are doing well, I would say you should be very happy with that and continue going to treatment regardless of the cost. In comparison to the costs of surgery, etc. and possibly permanent and/or serious nerve damage and other issues, it is probably a small cost when all aspects are considered.
Also, for the cyst size itself, that is great that is hasn’t grown, usually this means it has actually shrunk at least some. But there is scar tissue/swelling around the cyst so it takes quite a size change in large cysts particularly to really show up well on a scan. But even not growing is good, again all things considered.
One question I do have - are they doing acupuncture and herbs, or just herbs?
On the cost and use of herbs:
So, -some- practitioners do do a pretty hefty markup on the herbs to sustain their practice and to compensate them for the time of maintaining an herbal pharmacy. So if yours is in fact one of these, but you are otherwise happy with their treatment, talk to them and ask them for a discount - you will likely get it.
One of the great advantages of working with a practitioner is that they are generally (not always) fine-tuning your herbal prescription as time goes on and they watch your response to treatment. To you the formulas may look the same, but the amounts and/or ingredients are likely changing. This type of formula balancing is invaluable when working with herbal medicine. In short, you will likely not get the same response trying to create the formula yourself.
That said, if you have your practitioner write out the herbs (in Chinese) and dosages of each you can try purchasing the herbs yourself somewhere else and that -may- be cheaper (it could be more). But what you will be missing is someone watching over your case, following your progress and in short giving you the best care possible. Also, if the formula is a family secret of something along those lines, they likely won’t write it out.
More than likely, if you have a conversation with your practitioner and explain your financial situation they will work with you. If they don’t you should probably find someone else to work with. Personally, I think acupuncture is a critical part of the equation - although herbs are helpful as well. If you were to switch, I would see a practitioner who does both as well as tuina (Chinese medical massage). You will likely get the best results from that combination.
But just to be very clear, no, the formulas that are mentioned on our site for ovarian cysts are very likely inappropriate for your condition. But it really depends on your overall diagnosis from a tcm perspective, not the fact that you have a cyst. For more on this (and why only proper diagnostically based treatments will help you), read “What Does Acupuncture Treat?”.