My post last week got me thinking so yesterday while I was at Moore Wilson buying ridiculously expensive sheeps cheese, I asked some questions about whether they could supply bulk guar gum.
Good news! While they don't do guar gum in bulk (although they are trying to source that for me), they do sell it for $2.83 (GST exclusive) per 100gms.
I haven't played much with xanthum gum but I'm thinking I might have to start - Moore Wilson can order it in for you at a price of $23.56 (GST exclusive) for 1kg. The very nice men (there were two of them assisting me) told me that Pandoro, a very lovely bakery here in Wellington, use xanthum gum so I thought, if it's good enough for them, it's good enough for me. I'll be trying it out once I get myself sorted (am in Auckland for the next 10 days) and will let you know what results I get.
I have found that Moore Wilson are very helpful so if you don't live in Wellington, you could give them a call and see if they will ship to you.
Happy shopping and baking!