Looking to mail something this weekend? Better hurry up, if you want to save a lucky penny. The price of a First-Class Mail Forever stamp is going up from 49 to 50 cents — starting Sunday.

The United States Postal Service filed notice with the Postal Regulatory Commission (PRC) back in October of price changes to take effect Jan. 21, 2018.

You’ll also see 1-cent increases on postcard stamps and metered letters.

The Post Office’s filing did not include any price change for single-piece letters being mailed to international destinations or for additional ounces for letters, according to the Post Office.

All told, the prices would raise mailing services product prices about 1.9 percent, according to the Post Office. Shipping Services product will average a 3.9 percent price increase.

The Postal Service, an independent agency of government, has seen better days financially. It’s trying to stay afloat while seeking to pump billions in new delivery trucks to get packages more efficiently to customers. But it’s lost money for 10 consecutive years as online shopping grows.

Overall mail volume, which makes up more than two-thirds of postal revenue, dropped 27 percent over the last decade as people rely more on email and online bill payments.

Congress’ failure to address the Postal Service’s underlying financial woes, such as onerous requirements to pre-fund retiree health benefits, has left the commission more likely to embrace the request for more pricing freedom. The Postal Service has ruled out closing post offices and ending Saturday delivery to reduce costs.

The 242-year-old Postal Service generates $71 billion in annual revenue.

Here’s a summary of the increases.

•Letters (1 oz.)

49 cents goes to 50 cents

•Letters (metered)

46 cents to 47 cents

•Domestic Postcards

34 cents to 35 cents

New shipping services product prices will bump up Priority Mail prices 3.9 percent and Priority Mail Retail an average of 0.8 percent.

Here’s a look at those:

•Small Flat Rate BoxCurrent price:

$7.15 to $7.20

•Medium Flat Rate BoxCurrent price

$13.60 to $13.65

•Large Flat Rate BoxCurrent price:

$18.85 to $18.90

•APO/FPO Large Flat Rate BoxCurrent Price:

$17.35 to $17.40

•Regular Flat Rate EnvelopeCurrent price:

$6.65 to $6.70

•Legal Flat Rate EnvelopeCurrent Price:

$6.95 to $7.00

•Padded Flat Rate EnvelopeCurrent price:

$7.20 to $7.25

The Associated Press contributed to this story.