Small-gauge needles more than 1/2 inch?

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I've been doing my site injects with 29g .5 in slin pins for a while now. Seems to be working well, I rarely get lumps. A lot of the bros I've talked to recently seem to think that I need to go a little deeper though, at least 5/8 if not 3/4 inch. All I can find are 26-29g .5 inch. I've got 25g 5/8 but would like something smaller for things like bi's and calves. Anyone know where I can find something like a 27g 3/4in? K for someone who can show me where to find 'em!

 

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Bump for morning crowd. I've seen some 27g 3/4 inch listed, but never in the US or on a site I can buy them. I'd take anything longer than .5in and smaller than 26g... wow that sounds like something hammy would say