Ian there's one more way to save or perhaps I should say 'save the pennies... and use silver recovery.
When my fixer from both film paper and becomes 'well used', I pour it into a large brown-glass carboy. when the carboy becomes about 3/4 full, I add some used but not 'dead' developer and give the carboy a shake. you will eventually find a preciptate 'settling' to the bottom of the carboy. At this point I will syphon off most of the liquid (leaving room for more used fixer and required used-but not 'dead' developer solution ). Eventually you will end up with a very fine black "sludge" on the bottom of the carboy, known as "black silver" which is regarded as one of the purest 'forms' of silver which you can 'recover' by washing the sludge a number of time with clean water followed by the required time to wash a a few more times (I use about 6 'washings (with vigorous shaking and numerous 'settlings' that each are followed by syphoning off as much of the water as possible before a final wash before filtration of the liquid and the sludge contents. The last time I 'performed' this, one of my friends put it into a muffle furnace until it was 'liquified' and poured into a ceramic bowl to cool and 'solidify' into a silver 'blob' which was then sold to a jeweler.
Benefits? money into your pocket and less 'silver pollution' going into the sewer system (for which you will NEVER receive 'enough' in the way of monetary compensation). While It may take a year or more to recover enough to put a smile on your face... but the effort will eventually put some extra $$ back into your wallet for spending on more 'consumables'
You may also find the numerous water washings followed by syphoning off the water after the final 'settling' of the fine black "dust" somewhat of a slow process that takes both 'time and effort', but I think it is well worth the time and the effort.. but it does take Patience.. and it costs less than commercial silver-recovery 'systems'.
Ken