I have had a postal box here for years. Cost is approximately $10/month for a small box...not sure of larger boxes.
Priti is the owner and she is there religiously! Excellent service, always helpful. She will wait up after closing time for you if she knows you are a few minutes late (call her!). She will do everything in her power to help you with packages, postage, mail, etc.
The place is open 24 hours for getting your mail, and she closes at 5:30 on weekdays.
P.S. She accepts deliveries from UPS, FedEx, DHL, etc.