We are well understood your requirements to develop the Multi-Vendor based E-Commerce App that has the Android & iOS App for Customers, & Delivery Boy. And for the Vendors, there will be a Web-Admin to manage their Store, Inventory, Products, Price, etc. But the budget you have mentioned is very low as per your requirements. As we have estimated, it would cost you approx $8000 USD to $10000 USD.
However, we have already been built the Complete Solution of Multi-Vendor based E-Commerce App & Delivery App for the Item/Product Order & Delivery. That has the Super Admin(You) that can be managed by the Owner of that App further Analyze Orders & Business overview.
INITIAL FEATURES:
Vendors Web Admin- They can Register on the App, Manage their Profile, Listing Products, Pricing, Open/Close Time, Accept/Decline an Order, Offers/Combo, etc.
Customer- They can Register, Manage their Profile, Search Stores/Products, Product Detail, Select Product, Quantity, Order Online, Pay Online/COD, Live Tracking their Order, Rating/Review, etc.
Delivery Boy/Girl- Register, Manage Profile, Accept/Decline Order, Wallet, Collect the Paid/Unpaid Order from the Store, Deliver Order, Update Status, etc.
(YOU)Super Admin: Manage all Users, Validate User, Manage Notification, Track Reports/Sales, % commission on each deal, etc.
Let's Talk in detail.
Thank you & Regards,
Sagar!