Hi Heidi, nice to have you with us and nice to know you plan on sticking around :)
It's actually an interesting question and there are a few key points you would need to tick off to give yourself the best possible chance.
1. Make it a consumable product, something that gives you the ability to create repeat orders from your customers. This gives you the opportunity to build a customer base over time and once all those repeat orders start stacking up, that 5 dollar margin starts to multiply very quickly.
Repeat customers are the lifeblood of most businesses and e-commerce businesses are no different. If you don't sell consumable products that give you a chance to develop good solid ongoing repeat business or at least have a range large enough to encourage customers to come back and purchase different items from you again, then you are in a position where every sale you make is a dead sale.
Dead sale meaning that you now need to replace that customer who just purchased from you with a brand new customer to just match your sales for the period. If you want to then grow your sales, you need to counter that dead sale with at least two new customers to grow at a minimum rate.
This is where many, and I mean many, new e-commerce business's get into trouble. They can't effectively grow their business enough because they are constantly needing to replace dead sales with new customers just to keep the business afloat.
You'll never keep 100% of your customers, even if you are building a repeat customer base, but it's far easier to market a business to potential repeat customers to encourage them back, rather than constantly trying to replace dead sales with new customers every single time.
2. Increase your chances of sales by increasing your shipping destination options. It's just basic arithmetic, the more people that you offer the product to, the more you increase your chances of making a sale.
3. Professional image, build confidence with your customers through both a professional branded image and second to none customer service. The second to none customer service is EXTRA special if you are selling consumables to build up repeat customers.
You want them to know that they are getting looked after like no one else could possibly do.
Now they would be my 3 key points to focus on for your kind of plan. Of course, you have to also tick the other boxes like, competitive price, great supplier, you know the stuff, the everyday type of e-commerce stuff we all have to do, but I like your thinking.
Merry Christmas to you and your loved ones as well also :)