Why wait for the mailing? Just go online to TCAEasternDivision.org and register there. Costs you 15.50 and they mail the badge to you. The mail in method costs you 2 stamped envelopes and a trip to the post office which adds gas to the mailing cost.
For many years I waited for the booklet to arrive and mailed in the registration. Finally did it online in 5 minutes or so. Very convenient.