sanetsuikkeli

Hi Paul,
Thanks for your message and offer! I'll give it a thought 🙂
Best,
Sane

Although you could hide the add-to-cart button with some CSS, you'll need some JavaScript to be written if you want to add an alternative button with a different caption and functionality. The script will need to check whether the store's collection ID is a match and then add the alternative button in the correct location on the Product Detail Page. 
If you would like to purchase a pre-built, pre-tested solution then you may want to take a look at my Product Enquiry Form extension. It can add a 'Get Quote' button on a product-by-product basis. You simply tag the products that you'd like to affect.
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You can change the button text in the item page, but that's not really important here as change the function is more difficult. 
Why are you using a store page when you are wanting to offer quotes? Why not just build a page and use regular buttons that you don't need to code for?

Hi Ziggy,
Thanks for your reply. Initially I've built the shop on a shop template since I thought that direct buying would've been the best solution until I figured out that it's better for me to offer quotes since my clientele is so versatile and I'd like to keep some sort of flexibility with the prices. My B2B product offering is a huge pattern design collection including hundreds of designs. So the main reason for not replacing the page layout has been that there's just so much content involved and a lot of work behind the current shop page. 
But good to know that my problem is that tricky to be solved, so I should probably start replacing the current shop with a new page layout soon. 🙂 Thanks again for your message!
- Sane