Lightweight balcony blinds - where in Bangkok?

I need some lightweight blinds for my balcony to stop sunshine.

I don't care about the material but should be as lightweight as possible and reasonably weather resistant as I will need to attach them to an aluminium frame on the balcony ceiling (can't drill as it's a rented condo).

Prefer Roman blinds (the ones in Index/Homepro are too heavy) but roll ups are OK. I like those very thin flimsy cheap bamboo ones because they are so light but any suggestions would be welcome. I want to know where I can buy them in Bangkok. Thanks.