As far as I know, there is no solution on WP. We looked for it as we have multiple sites running WP.
We ended up using seotoaster V1 for this at https://www.123alarme.fr. V1 has been very stable. Now, they have a V2 with a CMS and an Ecommerce version, both are free and open source as well and the ecommerce version has the quote system built-in. The next V2 Ecommerce that is due this month, has a yet an improved quote system, we will upgrade at that point.
In a nutshell you can do automated display of quote. You can have on quote request form right on the product landing page (like we do), or you can have a quote request at the checkout along with other options such as credit card payment (we do this with a different site).
You have also a management interface to tweak quotes, or built from scratch (we take orders over the phone as well), and then send emails and collect payment online. Their staff is very helpful.
Hope this helps.
