Hi flaviarusso,
Yes and no. We may be able to point you in the right direction for making a filter, but I’d ask that you post a thread in our PRO Forum, as that’s were we do support and customizing help for PRO.
Alternatively, if you don’t mind waiting a bit, you can look forward to our upcoming Filters Bar plugin. Among other filters, it includes a price filter for your events. We don’t have an exact release date planned for it yet, but are hoping to have it available this summer. You can see a video preview of the plugin on this page (at the bottom).
Best,
Leah