Have you already tried asking directly at the bulk section or at customer service? Sometimes they'll order it for you if you push a bit, especially at big supermarkets. Otherwise, Asian and Middle Eastern food shops often sell it at regular prices, it's not more expensive than anywhere else. Also check out small discount supermarkets like Aldi or Lidl, which sometimes have alternative flours cheaper than regular organic ones.
For gluten-free crepes, honestly chickpea flour on its own is kind of tricky because it makes the batter really dense. You can mix it with other gluten-free flours like rice or corn flour to make it better. And the internet is still an option, even if you want to avoid it - prices online are often competitive and it saves you from struggling to find it in stores.