You would have to check for people in your area that do it, you could also purchase it online and inject yourself.. I think there is a company called trim nutrition that sells it..
Injections are obviously far more potent then lozenges.. one shot of 1000 mg is the equivalent of 30,000 mg of lozenges, this is because only a small amount of a lozenge is actually utilized the rest comes out in urine. Also hydro and cyano b12 have to bypass the digestive tract which can be a problem for some, these both have to be converted to methyl in the body as well.. Another reason for methyl supplementation as a better option, ideally throw in that adob12 and L carnatine Fumarate as well though!
Be sure to stay on top of other b vitamin levels as an excessive b12 intake can lower other levels.. Also even if you do not use freddd's protocol be sure to supplement with methyl folate as well.. taking methyl b12 without folate will lead to poor absorption and lower folate levels.