Vegas = IV Users version of Hell
I recently went to Vegas for a weekend and brought a nice amount of Heroin with me ( I am fucking slick, don't ask me how I did this ) but chose to not bring needles with me because I didn't want them to more thoroughly search me because they were in my luggage, not did I want to pay 20$ to check a bag just for this purpose and it was too late to Fed Ex them.
So the second I checked into my hotel I got a cab and started the pharmacy rounds. After several hours of looking and hitting one branch of each major chain pharmacy, I learned that none of them would sell syringes without a scrip. At this point I went back to the hotel and searched online for alternatives and started calling smaller pharmacies. No luck, ended the night smoking my H disappointed with myself for lack of foresight. The next day I started to hit pharmacies one by one (making sure not to re-visit any from the previous day) and tried to pull the right to life excuse for insulin and needles, no avail again, just a bunch of "very sorry" pharmacist's, most politely explaining that they could easily lose their job over it. After exhausting all this I began trying pet stores, and finally, a yes to my inquiry about syringes, I almost creamed my pants, I wanted to shout with joy, and then I asked about 28-31 guage and the answer ruined my day, no pet stores sold any needles that were anywhere near suitable for IV, if memory servers, smallest was 21 I believe.
If you are going to be visiting Vegas, make sure to plan ahead for syringes, borrow some sort of proof that you or someone close to you has diabetes, like a half empty Insulin bottle or something that couldn't be easily plucked out of a waste bin. Either that or mail/order them to be shipped to your hotel the day before you check in (as long as a hotel has you registered as a guest they will receive your package, if they wont, you need to stop staying in hotels that offer hour long "nap" rates).