It’s lame. I see this all of the time for various services and have experienced it a few times as well. If they didn’t post a price; ask how to get in touch with them, or simply check their profile to see if they’ve provided contact information and use it to inquire about pricing.
When sending an email, identify yourself and state your business in a professional and well articulated tone as someone who is serious about spending money. The same applies for direct/private messaging and phone calls.
I’ve received private messages and emails with one liners such as “how much you charge for xyz?” This type of inquiry is ignored because they’ve given me early signs of being a person I don’t want to have future business communications with.
Something to remember: There are various reasons why companies and or individuals do not post pricing to social media. Therefore, if you have to ask for a price, there must be a reason why you didn’t see it in the first place. Approach them appropriately.