In using a guitar amp, it's important to know how to manipulate the amplifier to achieve a number of different effects, including a clean or dirty sound. Learn about using the bass and treble knobs on an amp with help from a professional guitarist in this free video on guitar amps.
A 10 X 13 envelope (must be less than 1/4 inch thick) is considered a flat and costs 80 cents for the first ounce and 17 cents for each fractional ounce after that up to 13 ounces.
The prepaid Priority Mail envelope is $4.80 and can be purchased online in a lot of 10. USPS also offers ordinary letter sized envelopes. These are also charged the cost of postage plus a fee for the envelope which is around 5Â¢. You can purchase these one by one at your Post Office or you can order in boxes of 500 that are imprinted with your return address. There are also prepaid Aerograms for International Mail. Contact your local Post Office for the exact costs involved with Pre-Paid envelopes. Source(s): 24 year Postal Worker.