From a Whistler WS1080 User Guide found online, I would assume the offer is conditional along the same lines.
Service Out Of Warranty
Units will be repaired at “out of warranty” service rates
when:
• The unit’s original warranty has expired.
• A dated proof of purchase is not supplied.
• The unit has been returned without its serial number.
• The unit has been misused, abused, modified, installed
improperly, or had its housing removed.
The minimum out of warranty service fee for your Whistler
Scanner is $120.00 (U.S.). If you require out of warranty service,
please return your unit as outlined in the section “Service Under
Warranty” along with a cashier’s check or money order in the
amount of $120.00. Payment may also be made by MasterCard,
VISA or American Express. Personal checks are not accepted.
In the event repairs cannot be covered by the minimum
service fee, you will be contacted by a Whistler technical
service specialist who will outline options available to you.
IMPORTANT: When returning your unit for service, be
certain to include a daytime telephone number and an
email address (if applicable).