Morakniv Carbon Garberg if my go-to sub-$100 fixed blade recommendation and they sell them on Amazon (actually on sale for $60 right now).

Morakniv Garberg with Survival Kit Carbon Knife https://www.amazon.com/dp/B0825QDYJP/ref=cm_sw_r_cp_api_i_ZHB25W8EEX73M6B4KEMR