Another solution would be to try a two bath developer such as Thorntons two bath. 1500ml will happily develop 49 sheets before expiry. Also it is very inexpensive to make up and is easy to use. The formula is on the public domain so I am giving it here: -

Solution A

Water 1000ml
Metol 9.5g
Sodium Sulphite (anhydrous) 126g
Water to 1500ml

Solution B

Water 1000ml
Sodium Metaborate 18g
Water to 1500ml

Try 5 minutes in each solution with no rinse between solutions.