This is, of course, way more risky and pretty much illegal I guess, but it should probably be cheaper?
Not necessarily "condoning" the behavior, so much as sharing harm-minimization info here:
For safe/sterile injection, you need three things, all cheaply + easily available on the internet.
1) Bacteriostatic water - https://www.amazon.com/bacteriostatic-water/s?k=bacteriostat...
2) Sealed, sterile vials for preparation of the solution - https://www.amazon.com/Sterile-Vial/s?k=Sterile+Vial
3) Insulin syringes. 29g 0.5" work well. https://www.amazon.com/s?k=29g+1cc+1%2F2+inch+insulin+syring...
See my comment in this thread about IM administration of 4-AcO-DMT for more info: