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This is considered a toy telescope. Put the eyepiece with the largest number written on it into the focuser-- DO NOT USE the 2x barlow if you have one. Practice focusing on a distant object during the day time.
Commonly available astronomical telescope eyepieces are 1.25 inches in outside diameter. If the eyepiece tube on your scope is that dimension (inside diameter) then you will have no trouble finding lots of them in various focal lengths on Amazon or eBay. However, there are lots of "toy" telescopes that use proprietary eyepieces of smaller sizes, and these would be harder to get hold of.
You can buy an eyepiece from 1000 different retailers-- just get the correct SIZE usually 1.25 inch BUT many of these smaller scopes have .965 eyepieces-- MEASURE the hole. Here are two places that sell eyepieces--
You don't need to get Vivitar brand eyepieces to get additional ones for your telescope. I'm not sure of the specifications for this particular telescope but in general they come in two barrel sizes for the eyepieces. The diameter of your eyepiece is probably 0.965" but could come in the more standard 1.25". You can measure the diameter and determine this quickly.
Once you know the diameter to shop for you can look for the focal length of the eyepiece you wish to purchase. They are rated such as 4mm, 10mm, 25mm, etc. The smaller numbers give you higher magnification. You can calculate the magnification by dividing the telescopes focal length by the eyepiece focal length. For example, let's say your telescope is has a focal length of 360mm and you have an eyepiece rated 10mm. Divide 360 by 10 and that gives you a magnification power of 36.
You can find eyepieces at many telescope dealers on the internet. Your selection will be far less if you use 0.965" eyepieces. You can purchase 0.965" to 1.25" adapters so that you can use the larger eyepieces with your telescope. However, on some telescopes the adapters will cause the new eyepiece to not come into focus.
You'll also find that eyepiece prices go all over the place. A good general purpose eyepiece is a type called the Plossl. The better eyepieces have more coatings too that allow more light to get through to your eye. You'll find these listed with terms like "fully multi-coated".
Eypieces in telescopes usually come in two sizes .9" and 1.25" diameter. There are hundreds of scientific companies or telescope companies that can supply you with an inexpensive replacement. The eyepiece focal lengths, usually in millimeters, determines the magnification of the telescope. The focal length of the main lens divided by the focal length of the eyepiece is the magnification of the telescope. Usually two eyepieces are enough for your scope. Good luck