JSFiddle - React, Tailwind, and code Playground

by Qwerty_Wasd

HTML

<div class="price_byn">
    <div class="price">
        2<b class="f_normal">р.</b>
        <span class="cent">49<b class="f_normal">к.</b></span>
        <div class="old_price">
            3
            <b class="f_normal">р.</b>
            <span class="cent">31<b class="f_normal">к.</b></span>
        </div>
    </div>
    <small class="kg">за 1 шт</small>
</div>

JavaScript

Array.from(document.querySelectorAll("div.price_byn div.price *:not(.old_price)")).map((e)=>console.log(e.textContent))