I'm afraid I can't tell you where to get it, my friend, but I can tell you how to use MUSE (Alprostadil). It's a small pellet (suppository) that comes already prepared in a small plastic tube, that's inserted into the urethra (the tube inside your penis that you pee through).
Pressing a small button at the other end of the tube deposits the pellet inside the penis. Some massaging of the penis allows the pellet to dissolve and get distributed. It works be relaxing the blood vessels within the penis, increasing blood flow to the penis.
Have you actually been assessed by a doctor, and prescribed this medication, my friend? I ask as there are, as with all medications, risks of side-effects. These MAY or MAY NOT affect your decision to use the product.
See the following extracts from the first link below:
"Precautions While Using Muse
Do not use alprostadil if you have a penile implant unless advised by doctor.
If using the alprostadil suppository, use a condom when having sexual intercourse with a pregnant female. Although harm to the fetus is unlikely, using a condom will protect the fetus from exposure to this medicine. If a woman can become pregnant, use of contraceptive methods is recommended because the effects of this medicine on early pregnancy are not known.
Use alprostadil exactly as directed by your doctor . Do not use more of it and do not use it more often than your doctor ordered. If too much is used, the erection lasts too long and does not reverse when it should. This condition is called priapism. If the erection is not reversed, the blood supply to the penis may be cut off and permanent damage may occur.
Contact your doctor immediately if the erection lasts longer than 4 hours or if it becomes painful. This may be a sign of priapism and must be treated right away to prevent permanent damage.
If you notice bleeding at the place where you injected the medicine, put pressure on the spot until the bleeding stops. If it doesn't stop within 10 minutes, check with your doctor."
"Muse Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Rare
Curving of penis with pain during erection
erection continuing for 4 to 6 hours
erection continuing longer than 6 hours with severe and continuing pain of the penis
swelling in or pain of the testes
Symptoms of too much medicine being absorbed into the body
Dizziness
faintness
pelvic pain
flu-like symptoms
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Bleeding at place of injection, short-term
mild bleeding or spotting from urethra (suppository only)
pain at place of injection
painful erection
stinging of urethra (suppository only)
Rare
Female partners may experience itching or stinging of vagina when you first begin using the alprostadil suppository. These side effects may not be caused from the medicine but may result if female partner has not had frequent or recent sexual intercourse.
Bruising or clotted blood in penis at place of injection, usually caused by an incorrect injection
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional."
My personal experience of using MUSE was that I felt a burning sensation inside my penis, and it didn't have the desired effect with regards to getting an erection. Hopefully, if you do decide to use it, it will work better for you.