Which CMS is better to write an add-on to? Interested in a comparison (terms, price)?

Question

CMS

What you need: a website for an intercity motor transport company with the ability to sell and book tickets online.
The essence of the problem:
I plan to take some kind of engine (actually the first question is which engine would you recommend and why? . And hire a person to add an addition to it with the functionality I need. integration with 1c and the direct hands of a programmer.Again
, I found a plugin for WP that works with WooCommerce and costs $ 50, it almost fits, but you need to re-saw it again.(add location selection and other little things to the functionality) Which I don’t like anymore. Somehow there are a lot of crutches ...
In general, questions:
1. Какой движок посоветуете и почему для реализации данного проекта?
2. Сколько по времени и деньгам примерно обойдется написать такое? (понимаю что для разной CMS по разному. хотел бы увидеть побольше информации от знающих людей)
3. А может есть уже готовые решения, которые подойдут мне на 100% (никакие сервисы не рассматриваю)
З.Ы. писать с нуля на фреймворке или еще как либо прошу не предлагать. Нужно побюджетнее))

Answer 1

And how will you reserve seats SIMULTANEOUSLY on the website and at the off-line cash desk.
How will you check your tickets when you board the bus?
It is best to use a ready-made deployed and functioning solution - in the sense of buying not software writing services, but buying a ready-made service.
There are many of those. I know e-traffic.ru, for example. Surely there are others.
Doing it yourself is not worth it - there are a lot of pitfalls.
It's not just about the site.
We also need full integration - at the box office, on the website, at the dispatchers, etc., etc.
It's not even about money (хотя их немало нужно) - нужно СЕРЬЕЗНОЕ желание заказчика и ЕГО ВЛИЯНИЕ на автовокзалы (и пр. места продажи).