No, though it depends on what your e-commerce website is selling.
Banking on a single post containing all of your products won’t catch the eyes of your prospective customers. For example, let’s say you’re selling clothes.
Would you advertise everything, from shirts to sweaters to swimsuits in a single post? I wouldn’t: I’d go for products which are timely and have a high chance of converting ads to cash, like swimsuits and other forms of summer wear.
As for the budget, no idea. It depends on your niche, location, and how many people you want to reach.