Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
There are many sites on the internet which claim to sell Winstrol. Considering that the DEA monitors all the sites, the validity of the products is in question. The most common formulation of winstrol available in the USA is from Thailand. Winstrol is also smuggled in the country from México, Russia and Europe. Further, many injectable forms of winstrol are obtained illegally from the veterinary market. Winstrol is not a cheap product. On average, each tablet costs about $2 or 200 tablets of 2 mg each can be bought for $150-$200.
Always get your pills from a reputable dealer to ensure that you are getting your money’s worth and the right product.