Where to buy permanent hair dye online

I'm looking for websites or stores that sell permanent hair dye. Salons these days are quite expensive and I want to dye my hair without breaking the bank. Many cosmetic shops also only sell semi-permanent box dye. I've scoured Shopee, but I'm hesitant to buy these brands, because I haven't seen proper reviews of them and don't know how they work. Any suggestions would be helpful. Thank you