Quotegenerator

Quote generator plugin allows clients,staff or both create a quote and/or schedule appointments on the web as well as see availability calendar in real time.
Quote generator plugin for field service, installation, service contracting companies, etc.
The Order submitted via the forms are sent to the email address provided in the WordPress settings and a copy can be sent to the user who filled out the form (optionally).
The booking form can be linked to a PayPal or Stripe payment process.
Quote Generator includes a form builder for editing fields, including one or more automatically calculated fields based in the data entered in other fields. 
Easily customize to fit your pricing structure.
Creating a quote with Quote generator plus plugin gives you control of what and how to price. Quote generator also allow you setting up your database of items based on your cost and your terminology. The program also allow you to up sell the base price by adding options such as installments, accessories and other enhancements that will determine the final price.
Quote generator help you to easily enter dimensions and quantity and set discounts based on a size and quantity.
Set what time you are available. Only allow you to book appointments when you are available and block out any dates or hours.
Once created, the form can be quickly deployed by placing its corresponding short code where you?d like the form to appear: in page, post, or widget area.
Quote generator plus was meant to handle complexity a can be tailored to your needs.
Quote generator adapts to every device, desktops, tablets or smartphones. 
Supported by all major browsers.
Price estimation form 
Discount based on a size, quantity, total amount, etc. 
Online Order 
Availability calendar 
Schedule appointment 
Additional field can be added in order form and email 
PayPal and Stripe integration
Form elements: 
Numeric Slider (with image) 
Textbox 
Select box with images 
Checkbox (with image) 
on/off fields 
reCAPTCHA
Calculated Fields Form can be used for: 
1. Calculated form, example: general calculators, calculate quotes for appointments and services etc… 
2. Contact form: It can be used like any other contact form where you can define which fields will have the form. 
3. PayPal and Stripe payment button/form: It can be used to accept a PayPal and Stripe payments (optionally).
<h3>quotegenerator</h3>
Contributors: Quotegenerator 
Plugin Name: Quote Generator 
Plugin URL: http://quotegeneratorplus.com/wordpress 
Plugin Demo: http://quotegeneratorplus.com/wordpress/demo 
Donate link: http://quotegeneratorplus.com/wordpress
Tags: quoting, ordering, wp, php, eval, malicious, url 
Author URI: http://www.quotegeneratorplus.com 
Autor: Vitaliy Zakhodylo 
Requires at least: 3.5.1 
Tested up to: 4.7.2 
Stable tag: 4.7 
License: GPLv2 or later 
License URI: http://www.gnu.org/licenses/gpl-2.0.html
The Quote Generator plugin allows your customer to conveniently receive instant quotes and place orders online.

Quote Generator

Quote generator plugin allows clients,staff or both create a quote and/or schedule appointments on the web as well as see availability calendar in rea …

Azraf

You can easily add an quote functionality to your WordPress website.
The system will let user to choose your service-category/products first. When user select any catetegory/product, then it will show the child items name along with its price. 
If user select one or multiple items, it will show total price.
Optionally, you can add any other plugins short-code at the last step. E.g. you can use any form plugin short-code to show up a contact form to collect user data or manual booking.
GitHub Repository: 
https://github.com/MakeWebSmart/wp_mws_easyquote
<h3>Video</h3>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/lIiPOMS6IjA?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Easy Quote

Easily add quote functionality. User can select service category & items and will see the price and (optionally) with a contact form.

Quote Generator vs Easy Quote