Business management software varies in price depending on the type of software and the extent of its features. For example, simple workspace management and team collaboration tools like Wrike, Trello, and monday.com offer a lower price point ranging between $6 to $10/user/month.
If you're looking for a more sophisticated business management system that includes advanced project management tools, you can expect to pay a little bit more. Software vendors in that category — including ProofHub, Zoho One, Bitrix24 and others — will cost you between $45 to $65/user/month.
While you definitely need to consider your budget for whatever SaaS tool you invest in, I recommend giving each tool's depth of features more weight in your final analysis. Cheaper isn't always better. It's more important to satisfy all your business needs.