It is with regret that we are currently unable to supply the refill cartridges, However, there are two alternative cartridges that are compatible with both Blockblaster units and can be purchased through a company called Cream Supplies. They are a great alternative, however, some might find that they produce a slightly less powerful blast. Below are direct links to their website and the products that are compatible.
Soda Sparklets CO2 Charger Cartridges (Box of 10)
Cream Chargers by Mosa (Box of 24)
It is with great sadness that we can no longer supply our customers, but hopefully in the near future, circumstances may change and we can be back up and running again.