Hello Sherrikhan,
UnRestricted & Restricted licenses were available in PIX firewall but this device is now End-Of-Sale. Standalone firewall options available now is ASA. We have various options available on ASA interms of licenses/product.
For a small/home business, usually customers look forward for ASA 5505, 5510 or a 5520.
Here are a few links sharing complete product comparison & license features available.
Cost of the device varies with license requirement and you always have an option to upgrade the license.
Hope this helps. Please reply if you need further assistance.
Regards,
Chirag
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