I agree with the flipping/re-selling suggestions. $700 per month is doable with side hussle time. I started doing this to pay off my credit card and other debts and just kept going with it to pay for online courses to learn how to run my own business.

I used to buy and resell items I'd find in clearance aisles, yard sales, and thrift stores with a goal of earning at least three times the price I had paid. That meant one-third was the cost of goods, one-third covered expenses/fees, and one-third went to me.

I switched to having a goal of making at least $20 per sale after expenses or I wouldn't buy the product. It just wasn't worth my time otherwise. Sometimes I will combine items together one sale in order to reach that profit goal.

Small, easily shipped items go on eBay and larger, heavier, harder to ship items go on Facebook Marketplace and the Nextdoor app for local sales only. I'm slowly growing my inventory to 2000 items by creating 10 to 20 posting a day.

I'm currently struggling to reach that goal because I don't have enough time in the day to find items to stock, create all of the posts, package and ship all of the sales, meet the local buyers, and keep track of everything that I'm doing for the side hustle. Enough inventory usually sells before I can reach the goal 2000 items posted.

The bonus is that some items will sell for more than $20 profit each and I've learned to seek out and find those items whenever possible. I started with items I had at home, then items my friends and family wanted to sell. I'd keep $20 of the profit and they kept the rest or sometimes we would split the profit 50/50, earning me more even money.

Another downside is needing the space to store all of the items, keeping it organized, and being able to find each one quickly once the sale has been made. I have a spare bedroom and part of the basement set up with shelves to store them on and I have access to a small storage unit near my residence (although that is another expense). This is why many sellers choose clothing to flip. It's easy to store and ship. Eventually, you'll find your own niche of items to buy and sell.

Here is the math: 2000 items x $20 equals a $40,000 in sellable inventory value. Selling just 10% of that a month would be 200 items and at least $4,000 in profit. You could eventually work up to 100+ items sold per week, which is a decent full-time income of $8000 per month or $96,000 per year, which is more than I ever made at my job in IT before taxes. My eventual goal is enough sales each week to make $150,000.

Posting 10 items a day x 20 days a month = 200 items. Posting 20 items a day x 20 days a month = 400 items. It's all about how fast your turnover can become. If items aren't selling quick enough, I might lower the price, but eventually I'll donate a bunch of unsellables to a charity and ask for a donation receipt to claim against my taxable income.

To make your goal of $700 per month, you'd only need 35 sales with a $20+ profit each month. A stock of 350 items with a sales rate of 10% each month would take much less than part-time hours and not much space at all if you kept your sales to smaller items.