I don't even use a new pin every time. You can re-use a pin. I don't know why there's such a stigma about it. Just clean the area you are injecting into with an alcohol swab and be cautious as you return the cap. The needle is exposed to the air before the first injection, and then your won body during. What's the difference if it is exposed to the same two environments for multiple injections? The only problem is dulling. But, a tiny slin pin won't be dull enough to actually cause pain for several injections. Just my 2 cents on it. I wish I had a dime for every time someone says, "You're gonna get an infection!" and another dime for the aprox. 1500-2500 (I don't even know how many actually, but it's a lot) injects I've done over the years without one problem whatsoever.
But, yes, the price can approach a regular dose of blue tops pretty easily. If you want the most efficient protocol, money and results wise, check through the threads I've started and find one about melatonin, peptides and gh combo. I've written about it a lot but still not too many people give it a try. It's crazy effective and saves a ton of money. I get more out of 1 iu of blue top gh, 100 mcg ea of the peps, used 1 x day then I did out of the 3 x day pep protocol or 5+ iu of gh. From feel, and my experience I'd say I'm getting the equivalent of 8 iu of gh from the protocol combo.