SQL Server (implied by database tables mention) Startups

.NET Invoice was an ASP.NET invoicing product that Rob Walling acquired for $11,000 after discovering it ranked well organically and was generating ~$700-$1,000/month. After fixing critical bugs and raising the price from $98 to $295, he grew it to peak revenues of $5,000/month while working nights and weekends during his consulting day job. The product became a valuable learning experience in SEO, marketing, and SaaS fundamentals, though the market ultimately proved limited.