Life Tip Pro:
You do not need to pay retail prices for UPS, or wait to pay at a post office. Anyone can create a UPS account and print shipping labels at home, and USPS offers click and ship as well. It is even easier if you're using USPS flat rate boxes, you won't need to measure or weigh things. For UPS, you'll likely get a slightly cheaper rate than you'll get at Staples or the UPS Store.