You can also use frozen okra - in the frozen vegetable section but also sometimes in the "ethnic" frozen foods section.
You can find xanthan gum and preservatives such as potassium sorbate at sites like Premium ingredients at less than premium prices... Lotioncrafter
As many others have found -both okra and flax seed gel will spoil after a few days +. You can keep it in the refrigerator but I've found I'm less likely to use it if I have to run to the fridge to get it before I shower. So you may want to seriously consider using preservative. I still make & freeze small batches.