Our bee group collects wax, and sends it to NZ Beeswax, for conversion to Medium brood, and even with courier each way, well worth doing - but if you are rural, pays to use a townie address to have foundation sent to, as courier is substantially cheaper. You don't get your wax back, but get a credit in weight. We buy 15 kg cartons of each FD and 3/4, and well worth the time. Each contributing beek must fill in a 'Producer Statement' - giving details of what treatments are used etc. To calculate approximate cost, Work out courier costs each way, + total cost of conversion - $6.50 /kg + GST cost is in their catalogue - at present it is $27.88 +GST. That is getting it back in 15kg cartons, and if you have any spare, you will have hobbyists queueing to buy it off you. Ring Tanya, and talk to her - she will email the producer statement form to you.