I used the ones that came with the kit that my partner bought for me. Mad Millie only has this one. They don't have any GEO.
We live in a small country town in Victoria, Australia. In the area where the bush fires were. Two hours away from any major town.
Mail order is the only way to get any different supplies. Have been looking at Cheeselinks, think this is a New Zealand company.
Cheeselinks is a Victorian company who are very helpful, I buy from them. Check their website www.cheeselinks.com.au