HI there,
I can create a ad-on plugin for wordpress that will work with Woocommerce(a very popular plugin for e-commerce). It will allow you to add products, my plugin will allow you to choose whether you stock that products, and if not then it will let you enter phone number/contact details of where user can purchase that products from.
If you are open for this project, then I can give you more detailed proposal by tomorrow on how to achieve this, just let me know by reply.
I can deliver custom plugin by $180 only, I bid $250 as FL didn't allowed me to bid $180. You can use me for some other work for remaining 70$.
Let me know.
Thank you.