They want you to call them so their can gauge how much they can ask you/your company.

You’re getting scammed.

Feel the same way about restaurants that don’t have prices on their menu.

Basically assume “if you have to ask you can’t afford it” because if the price wasn’t an immediate deal breaker they wouldn’t be withholding it.

Same with job listing, of they don’t list the salary it’s because they know that stating the salary would make you less likely to apply.

I buy a lot of things for work and if I can find a company that has the price listed I go with them over the one that makes me contact sales for a quote almost every time