This is your most reliable option. You can walk up to the counter and ask for a single stamp of any denomination.
Stores like Staples or Office Depot sometimes offer individual stamps at their shipping counters. buy single stamps
Valid for 1-oz letters forever, regardless of future price hikes. $0.61 For standard-sized postcards. International Stamp $1.70 For standard 1-oz letters sent globally. Print Your Own Online This is your most reliable option
If you have a printer, you can skip the trip to the post office: Stamps - USPS Store buy single stamps
