When i was still IVing heroin/sub I used Reli On 1cc 30G 5/16 inch syringes. I would buy a 100 pack normally, which was around 13 dollars. A single package was under 2 dollars though the last time I asked for one they told me they were no longer selling individual bags. I don't know whether they were telling me the truth or just lying because they didn't want to sell me any needles. I didn't have enough for a box at the time so I had to go home and grab some more cash to afford a whole box which they sold to me.
I know it's kind of irrelevent but I thought I'd mention it as buying a single bag may no longer be available at wal mart if they were telling me the truth.
The 100 pack comes with 10-10 packs of syringes which are not individually wrapped. I prefer ones that are not individually wrapped as it causes less waste and you don't need to tear open a package every time you get a new rig.
The syringes themselves I havent had any problems with really. They have reasonably smooth plunger action, and easily suck up a solution without any problem. The needle sharpness is usually good though there will usually be a few in my pack of 100 that seem to be slightly less sharp than others. You could probably get away with using them 2-3 times and they will still be sharp enough to penetrate very easily, though I personally use a brand new needle every time unless I happen to run out, in which case I will use the last few I had used 1 more time each until I pick up another box.
I strongly suggest if you're a daily IV user to spend the money to get a box of 100. I know when your addicted to some sort of opiate you IV you tend to not have a lot of disposable income, and opt for the 10 packs because they are cheap, but in most cases in my experience people who just buy 1 bag of rigs will end up using each of them 2-3 times before they get another one causing damage to their veins. Something I do to ensure I don't reuse needles too many times is break the tip after I've used it twice. This forces me to buy a new package once my needles are all very unfit for use.
Do yourself a favor and just spend the 13 bucks for a pack of 100, you'll be set for a while in if you do end up running out you'll have plenty of rigs you can wash and use once more. Obviously it isn't advisable to use a syringe more than once, but twice isn't that terrible and is much better than using the ones from a 10 pack countless times until you finally get another one. 13 bucks man that's around 1 bag of dope most places...not a huge deal and helpful in the long run.
For the price they are well worth it. The needle size works for me as I don't need to hit veins that are deep, I have plenty that are clearly visible close to the surface.
I have had 1 or 2 clog since I started using them, but considering I've gone through hundreds it isn't a common problem with them. I'd rate them an 9/10 for the price and reliability. I've had BD's in the recent past which many consider the best brand, and quite honestly these are pretty much on par with the BD's maybe with slightly lesser quality, which the price more than makes up for. A 90 pack of BD's goes for around 20$ while a 100 pack of these goes for 13$.